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elena-14-01-66 [18.8K]

2 years ago

6

Kaitlyn bought movie tickets for herself and 12 family members. If a movie tickets costs $13.75 how much did kaitlyn spend on al

l the tickets

1 answer:

Virty [35]2 years ago

7 0

12 people plus herself is 13 people. So 13.75(13)=178.75.

So, $178.75 for all tickets. But... I might be wrong.

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3 years ago

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3 years ago

A package contains 12 resistors, 3 of which are defective. If 4 are selected, find the probability of getting

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Answer:

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Step-by-step explanation:

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Hypergeometric distribution:

The probability of x successes 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 successes.

N is the size of the population.

n is the size of the sample.

k is the total number of desired outcomes.

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:

12 resistors, which means that $N = 12$

3 defective, which means that $k = 3$

4 are selected, which means that $n = 4$

To find an specific probability, that is, of x defectives:

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

$P(X = x) = h(x,12,4,3) = \frac{C_{3,x}*C_{9,4-x}}{C_{12,4}}$

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3 years ago