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