a. What is the probability that the average time will be at least 3 minutes?
b. What is the probability the average time will be between 3.05 and 3.2 minutes?
Please use the attachments provided and not only excel functions.© BrainMass Inc. brainmass.com June 3, 2020, 9:30 pm ad1c9bdddf
M = 3.1, SD = 0.60, n = 36
(a) z = (x - M)/(SD/sqrt n)
z = (3 - 3.1)/(0.60/sqrt 36) = ...
Neat solution is provided to the problem.