ns Write only a number as your answer. Round to 4 decimal places (for example 0.

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ns Write only a number as your answer. Round to 4 decimal places (for example 0.1849). Do not write as a percentage. Your Answer: Answer Save Question 4 (1.2 points) The probability that a student uses the Academic Resource Center on a regular basis is 0.32 . In a group of 21 students, what is the probability that exactly 7 of them use the Academic Resource Center on a regular basis? Write only a number as your answer. Round to 4 decimal places (for example 0.2416). Do not write as a percentage Your Answer:

Explanation / Answer

Here we have n = 12, p = 0.25

We know the Binomial pdf as:

p ( X = x ) = nCx px ( 1 - p) n-x

Here we need to find

p ( X = 4 ) = 12C4 0.254 ( 1 - 0.25) 12-4

= 0.1936

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