Suppose that the time for e-mail confirmation of an online purchase is uniformly distributed between 1 and 6 minutes. The probability that an e-mail confirmation arrives
Within 3 minutes is
A) 0.50
B) 0.40
C) 0.60
D) 0.80
E) 0.10

Question

Quizplus · Accepted Answer

Since the distribution is uniform, the probability of the email confirmation arriving within the first 3 minutes is equal to the proportion of the total time interval that the first 3 minutes cover. That is,

P(email arrives within 3 minutes) = (3-1)/(6-1) = 2/5 = 0.40.

Therefore, the best choice is B.

Suppose That the Time for E-Mail Confirmation of an Online