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Aleks04 [339]
3 years ago
5

You'd like to see how many baseball and soccer games you can attend this spring. Travel

Mathematics
1 answer:
adoni [48]3 years ago
4 0

Answer:

x = 7

y = 1

Step-by-step explanation:

Let's assign the baseball to x and soccer to y. If each baseball game takes 2 hours and each soccer game takes 1 hour and we don't want to spend more than 15 hours we get the equation:

2x + y = 15

We have one equation now and we can get the second one from the number of games. We know that we want to attend 8 games therefore the number of baseball games plus the number of soccer games must be equal so we can use the equation:

x + y = 8

Now that we have our two equations we can use elimination to get x and y.

2x + y = 15

x + y = 8

isolate one of the variables from either equation. I chose to isolate x from the second equation givnig me:

x = 8 - y

now we can plug x back into the first equation to solve for y.

2x + y = 15

2(8 - y) + y = 15

16 - 2y + y = 15

-y = -1

y = 1

now that we have y we can solve for x by pluging it back into one of the origoriginal equations.

x = 8 - y

x = 8 - 1

x = 7

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10. A random sample of 10 fibers is taken from a collection of 92 fibers that consists of 43 fibers of polymer A, 17 fibers of p
vazorg [7]

Answer:

0.1150 = 11.50% probability that the sample does not contain any fibers of polymer B

Step-by-step explanation:

Hypergeometric distribution:

The probability of x sucesses is given by the following formula:

P(X = x) = h(x,N,n,k) = \frac{C_{k,x}*C_{N-k,n-x}}{C_{N,n}}

In which:

x is the number of sucesses.

N is the size of the population.

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Combinations formula:

C_{n,x} is the number of different combinations of x objects from a set of n elements, given by the following formula.

C_{n,x} = \frac{n!}{x!(n-x)!}

In this question:

Fibers are chosen without replacement, which means that we use the hypergeometric distribution.

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a. What is the probability that the sample does not contain any fibers of polymer B

This is P(X = 0).

P(X = x) = h(x,N,n,k) = \frac{C_{k,x}*C_{N-k,n-x}}{C_{N,n}}

P(X = 0) = h(0,92,10,17) = \frac{C_{17,0}*C_{75,10}}{C_{92,10}} = 0.1150

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Answer:

Step-by-step explanation:

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2)4(20+22)

3)6.40+6.5

4)12(2+7)

8 0
3 years ago
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