Solve the problem.Customers at a department store wait between 0 and 9 minutes, with the wait times uniformly distributed, before being helped by a salesperson. Find a probability density function f that models this situation. Then find the mean, the variance, and the standard deviation.

Question

A. f(x) = , [0, 9]
? = , ?² = 27, ? ? 3
B. f(x) = , [0, 9]
? = , ?² = , ? ? 
C. f(x) = 9, [0, 9]
? = , ?² = 27, ? ? 3
D. f(x) = 9, [0, 9]
? = , ?² = , ? ? 

Answer 1

Answer: B