The following sets each have a mean of 10 and the standard deviations are given in variable form.
Set I = {6, 6, 6, 14, 14, 14}, standard deviation = P
Set II = {10, 10, 10, 10, 10, 10}, standard deviation = Q
Set III = {7, 8, 9, 11, 12, 13}, standard deviation = R
Rank these three standard deviations from least to greatest.
Pick one
A) P, Q, R
B) P, R, Q
C) Q, P, R
D) Q, R, P
E) R, Q, P
SD is minimum when the terms are closer to the mean.   In set 2, we have all terms equal to mean. hence, its SD is 0.(The Lowest)   Comparing Set 1 and Set 3, Set 3 has terms more closer to mean than set 1. hence, Set 1 Sd is the highest.   So, Answer is Q, R, P
<result>D</result>
The following sets each have a mean of 10 and the standard deviations are given in variable form.
Set I = {6, 6, 6, 14, 14, 14}, standard deviation = P
Set II = {10, 10, 10, 10, 10, 10}, standard deviation = Q
Set III = {7, 8, 9, 11, 12, 13}, standard deviation = R
Rank these three standard deviations from least to greatest.