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