3) It has been found that 20% of students who enroll in an introductory statistics class withdraw before the end of the semester. In a class of 15 students, what is the probability that: (answer to three decimal places) a) exactly 3 students withdraw? b) between 2 and 6 students withdraw? c) at least 1 students withdraws? d) less than 4 students withdraw?

Q: 4. 10p-p-2

A: The given expression is : 10p2-p-2 To factorize the given expression.

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A:

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Q: 5475

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A:

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A: Given: 112 2017 Here we use combination formula. nx = Cn,x = n!x!(n-x)1