If 80% of the applicants are able to pass a driver's proficiency road test, how do you find the mean, variance, and standard deviation of the number of people who pass the test in a sample of 300 applicants?

Tarnayfu 2022-08-09 Answered
If 80% of the applicants are able to pass a driver's proficiency road test, how do you find the mean, variance, and standard deviation of the number of people who pass the test in a sample of 300 applicants?
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Answers (1)

neglegir86
Answered 2022-08-10 Author has 12 answers
Expected value of X, M e a n = μ = n p = 300 0.8 = 240
Mean is: μ = 240
Variance: σ 2 = n p ( 1 p ) = 300 ( 0.8 ) ( 1 0.8 ) = 48
Variance: σ 2 = 48
Std Dev: σ = σ 2 = 48 6.928203 6.928
Standard deviation: σ = 6.928

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