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 standard deviation of this distribution is ___.
A)unknown
B)8.33
C)0.833
D)2.89
E)1.89

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The Answer of 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 standard deviation of this distribution is ___.
A)unknown
B)8.33
C)0.833
D)2.89
E)1.89

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

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