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Example 6.1b: In Chris' Stat 225 class, 75% of the students passed (got a C or better) on Exam
1. Suppose we pick 10 students with replacement. Let X be the number of student(s) who
passed. What is the variance of X?
Solution
Variance = n*p*(1-p) = 10*0.75*0.25 =1.875

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  • 1. Example 6.1b: In Chris' Stat 225 class, 75% of the students passed (got a C or better) on Exam 1. Suppose we pick 10 students with replacement. Let X be the number of student(s) who passed. What is the variance of X? Solution Variance = n*p*(1-p) = 10*0.75*0.25 =1.875