If x, the time (in minutes)to complete an oil change job at a certain auto service station, is uniformly distributed over the interval 20 to 30, inclusively (20 $\le$ x $\le$30), then the mean of this distribution is ___.
A)50
B)25
C)10
D)15
E)5

Question

Quizplus · Accepted Answer

The mean of a uniform distribution is equal to the average of the lower and upper bounds of the interval. In this case, the lower bound is 20 and the upper bound is 30, so the mean is (20 + 30) / 2 = 25.

If X, the Time (In Minutes)to Complete an Oil Change ≤\le≤

If X, the Time (In Minutes)to Complete an Oil Change $\le$