Here’s some information about what Pi (π) is:
Intro
Pi (π) is a number whose decimal digits go on forever and they don’t repeat itself. It’s in the category called irrational numbers, because you can’t rationalize pi.
History
Before pi was created, famous philosophers used tape measure to measure the ratio between the circumference and diameter of a circle. And when they did, they found out that the ratio between the circumference and diameter was roughly about 3.1. But as mankind evolved to have better tape measures and more technology they can use, they found out that the ratio between the circumference and diameter had a number that kept on going forever. It would go like 3.1415926.... and it would go on and on. So, the number pi was introduced by scientists and mathematicians found out that pi turned out to be an irrational number.
Daily Usage
Pi was turned into the symbol π so people don’t have to write the full digits of pi. But now we use pi now in our daily mathematical lives. Pi is almost in every form of mathematics, especially in geometry and trigonometry. Pi is full of new things and it really expanded our understanding of mathematics.
Pi (π) truly has an interesting and fascinating history
Hope this helps! :)
In a biomedical research study, it was determined that the survival time, in weeks, of an animal subjected to a certain exposure of gamma radiation has a gamma distribution with α= 5 and β=10.
a. What is the mean survival time of a randomly selected animal of the type used in the experiment?
b. What is the standard deviation of survival time?
c. What is the probability that an animal survives more than 30 weeks?
Answer:
Step-by-step explanation:
From the given information:
Let X be the random variable;
The mean survival time is E(X):
E(X) = μ
E(X) = ∝β
E(X) = 5 × 10
E(X) = 50
To find the standard deviation, we must first determine the variance:
[tex]V(X) = \sigma ^2[/tex]
[tex]V(X) = \alpha \beta ^2[/tex]
[tex]V(X) = 5 \times (10)^2[/tex]
[tex]V(X) = 5 \times 100[/tex]
[tex]V(X) = 500[/tex]
The standard deviation is:
[tex]\sigma =\sqrt{V(X)}[/tex]
[tex]\sigma =\sqrt{500}[/tex]
[tex]\sigma =22.361[/tex]
The standard deviation of survival time = 22.361
(c)
P(X>30) = 1 - P(X ≤ 30)
[tex]= 1 - \int \limits ^{30}_{0} \ f(x) \ dx[/tex]
[tex]= 1 - \int \limits ^{30}_{0} \dfrac{1}{\beta^{\alpha} \Gamma \alpha }x^{a-1} e ^{-x/\beta } \ dx[/tex]
[tex]= 1 - \int \limits ^{30}_{0} \dfrac{1}{\beta^{\alpha} \Gamma (5)}x^{5-1} e ^{-x/10 } \ dx --- (1)[/tex]
So, if:
[tex]y = \dfrac{x}{10}[/tex]
[tex]dy = \dfrac{dx}{10}[/tex]
10dy = dx
and limits of y are 0 and 3.
because;
for x = 0
[tex]y = \dfrac{0}{\beta}[/tex]
y = 0
For x = 30
[tex]y = \dfrac{30}{10}[/tex]
y = 10
From (1);
[tex]P(X> 30) = 1 - \int \limits ^{30}_{0} \dfrac{1}{\beta^{\alpha} \Gamma (5)}x^{5-1} e ^{-x/10 } \ dx[/tex]
[tex]P(X> 30) = 1 - \int \limits ^{3}_{0} \dfrac{(10y)^4}{10^{5} \Gamma (5)}e ^{-y } \ dy[/tex] since y = x/β
[tex]P(X> 30) = 1 - \int \limits ^{3}_{0} \dfrac{10^4 y^4 \ e^{-y} }{10^{4} \Gamma (5)} \ dy[/tex]
[tex]P(X> 30) = 1 - \int \limits ^{3}_{0} \dfrac{y^4 \ e^{-y} }{ \Gamma (5)} \ dy[/tex]
Since;
[tex]F(a, \alpha )= \int \limits ^a_0 \dfrac{y^{a-1}e^{-y}}{\Gamma (\alpha )} dy[/tex]
Then;
P(X> 30) = 1 - F(3,5)
From the table of incomplete gamma function;
P(X > 30) = 1 - 0.185
P(X > 30) = 0.815
Thus, the probability that an animal survives more than 30 weeks is 0.815
a)The mean survival time of a randomly selected animal of the type used in the experiment is 50.
b)Standard deviation of survival time is 22.36
What is the standard deviation?The standard deviation of a random variable, sample, statistical population, data set, or probability distribution is the square root of its variance.
Suppose x is the random variable.
It is given that α= 5 and β=10.
So, the mean survival E(x)=α β
The mean survival E(x) =5*10
The mean survival E(x) =50
We know that Variance =α β²
So, Variance = 5*10²
Variance =500
We know that standard deviation σ = √Variance
σ = √500
σ = 22.36
Therefore, a)the mean survival time of a randomly selected animal of the type used in the experiment is 50.
b)Standard deviation of survival time is 22.36
To get more about standard deviation visit:
https://brainly.com/question/475676
The standard deviation is:
The standard deviation of survival time = 22.361
PLEASE I NEED THE ANSWER TO 1 + 1
Answer:
uhhhhh 3
Step-by-step explanation:
Step-by-step explanation: I know, hardest question known to man.
use the unit circle to find the inverse function value in degrees . sin
y - 3x = 5 use intercepts to solve the questions=
Answer:
I hoped that helped
Please help me out I’m really confused on this one
Answer:
3.46410162 i
Step-by-step explanation:
The i is for imaginary because you cannot take the square of a negative number. Hope this helps
help me please I will give you so much point and mark you as bril\
PLZ
PLZ
PLZ
ANYBODY?
Help it’s due in 36 mins
Answer:
Step-by-step explanation:
f(x)= -2x-4
when x= -1
f(-1)= -2*(-1) -4= 2-4= -2
when x=4
f(4)= -2*4 -4 = -8-4 = -12
Best answer gets Brainly!!!
Choose 3 Plz!
Answer:
I think it's C and E and A
the average price of a barrel of crude oil in a recent year was 65.37. which estimated price is incorrect.
a. 65.37
b. 65.40
c.66.00
d.70.00
Answer:
65.37 isn't an estimated price, it's an exact price....
Answer:
65.37 because the ? asked 65.37 in the ? so the wrong answer is 65.37
Step-by-step explanation:
What is the place value of the 3 in the number 6,370,524,891?
ten crore is answer for India system
Step-by-step explanation:
hundred million is answer for international system
i need help with this, least to greatest. Math.
Answer: least : -1/4 middle: -0.15 greatest: -0.6
if it’s incorrect change places with the 1/4 or 0.15
the answer is -0.6, -1/4, -0.15
If 1 loaf of bread requiers 8 eggs to make a french toast how Many eggs are needed to turn 32 loaves of bread into french toast?
Answer:
Step-by-step explanation:
1 loaf = 8 eggs
32 loaves will need 32*8 eggs or 256 eggs
what is 300000 x 35546 Will be given brainliest!!!!!!!!!!!!!
Which table contains a set of non-linear ordered pairs?
PLEASE HELP
What is the image point of (4, 6) after the transformation
T 5,2 r y=-x?
Answer:
(-1,-2)
Step-by-step explanation:
how so you report a user. I've found a child offender on here.
Answer:
Click on the flag icon next to the question & report it with a reason.
Step-by-step explanation: Hope this helped your question, and I hope you would click on the crown icon next to my answer/ please give me the brainliest if you like.
Answer:
You have to go to their accc and then press the 3 dots and select report. Finally write the reason and done.
Step-by-step explanation:
The number of fish in a Lake decrease by 25% between last year in this year last year there were 60 fish in the Lake what is the population this year
Answer:
45
Step-by-step explanation:
PLEASE SOMEONE HELP ME WITH THIS QUESTION I DONT GET IT ITS DUE TODAY
Byron bought a keyless entry door lock that has the digits 0 through 9 on the keypad. He wants to choose a three-digit
entry code. How many different combinations are possible, if the digits can be repeated?
1. 27
2. 30
3. 729
4. 1,000
Answer:
the answer is 10,000
Step-by-step explanation:
thats what i put on the test and got it right
Answer:
d
Step-by-step explanation:
What is the slope of the line that passes through the given points?
(8,7) and (8,5)
Answer:
2
Step-by-step explanation:
How do I shade the graph
a _______ is part of an ordered pair that shows the location of a point
Answer:
point
Step-by-step explanation:
Answer:
coordinate plane
Step-by-step explanation:
What equation has a negative slope and a y-intercept of zero?
Answer:
An equation that has a negative slope and a y intercept if the slope is negative and the intersection point is negative.
Step-by-step explanation: Example Y=-3x-4(negative
Posotive=Y=3x+4
Identify the model that can be used to solve the equation 3x + 2 = 5x - 8
Answer:
x = 5
Step-by-step explanation:
3x + 2 = 5x - 8
-3x -3x
2 = 2x - 8
+ 8 + 8
10 = 2x
÷ 2 ÷ 2
5 = x
helppppppppppppppppppppppppppppppppppppp
Answer:
Option C is correct.........
The equation x^2/24^2 - y^2/b^2 = 1 represents a hyperbola centered at the origin with a directrix of x = 576/26.
What is the value of b?
A. 10
B. 16
C. 20
D. 26
Answer:
a
Step-by-step explanation:
edge
The value of B is 16.
The correct option is B
What is a quadratic equation?A basic quadratic equation, or a second-order polynomial equation with a single variable, is represented by the equation x : ax² + bx + c = 0, where a≠0 for the variable x. As it is a second-order polynomial equation, which is ensured by the algebraic fundamental theorem, it must have at least one solution.
The standard equation for a hyperbola centered at the origin is:
(x²)/(a²) - (y²)/(b²) = 1
where "a" and "b" are the lengths of the transverse and conjugate axes, respectively. To find the value of "b" for the given hyperbola equation, we need to first rewrite it in the standard form.
(x²)/(24²) - (y²)/(b²) = 1
Multiplying both sides by (24²)(b²), we get:
b²(x²) - (24²)(y²) = (24²)(b²)
Dividing both sides by (24²), we get:
b²(x²)/(24²) - y² = b²
Comparing this with the standard equation, we can see that a = 24 and b is the square root of the constant term, which is b² = 576. Therefore, b = 24.
However, the given directrix of x = 576/26 is not consistent with the equation of the hyperbola. The directrix for a hyperbola with center at the origin and transverse axis along the x-axis is given by x = a²/b. Using the value of a = 24, we can find the directrix as:
x = (24²)/b
Setting this equal to 576/26, we get:
(24²)/b = 576/26
Solving for b, we get:
b = 16
Therefore, the correct answer is (B) 16.
To learn more about the quadratic equation;
https://brainly.com/question/17177510
#SPJ2
You purchased concentrated cleaner that must be diluted (watered down) before use. Container A is the cleaner, which is a 20% solution. Container B is pure water. You are mixing together the contents of Container A and Container B to produce 40 gallons of 9% solution. How many gallons from each container are needed to create the 40 gallons of 9% cleaning solution? Write your answers as integers only.
Container A: 20% Cleaning Solution =
gallons
Container B: Pure Water =
gallons
Answer:
Amount of chemical solution = 18 gallon
Amount of pure water = 22 gallon
Step-by-step explanation:
Assume;
20% of solution = x
So,
Amount of pure water = 40 gallons - x
Amount of pure water = 40 - x
Computation:
20% of x = 9% of 40 gallon
0.2 x = 3.6
x = 3.6 / 0.2
x = 18 gallon
So,
Amount of chemical solution = 18 gallon
Amount of pure water = Total solution - Amount of chemical solution
Amount of pure water = 40 -18
Amount of pure water = 22 gallon
What is the difference? 63 -43
Answer:
63 - 43 = 20
Step-by-step explanation:
Answer:
20
Step-by-step explanation:
63-43= 20
(Q1) Georgia went to Kroger to price Doritos chips and found that she could buy a 10.5 ounce bag for $4.29. What is the price per ounce for these chips at Kroger? Juan went to Byler's and found a 13 ounce bag of Doritos chips for $5.12. What is the price per ounce for these chips at Byler's? From which store should they purchase their Doritos chips? Think about this on your own first before sharing with your group . Recond you answers in the space below
Answer:
Step-by-step explanation:
1.- 0.40
2.- 0.39
En Byler's
find the measures of Arc AD, Arc DB, Arc AB
Answer:
Need the radius if you are finding the exact arch length. but if angle, X is 15 so just sub it in.