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 = {6, 6, 6, 14, 14, 14}, standard deviation = Q
Set III = {7, 8, 9, 11, 12, 13}, standard deviation = R
Rank these three standard deviations from least to greatest.	Choices: 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 1, we have all terms equal to mean. hence, its SD is 0.(The Lowest)   Comparing Set 2 and Set 3, Set 3 has terms more closer to mean than set 2. hence, Set 2 Sd is the highest.   So, Answer is P, R, Q
<result>B</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 = {6, 6, 6, 14, 14, 14}, standard deviation = Q
Set III = {7, 8, 9, 11, 12, 13}, standard deviation = R
Rank these three standard deviations from least to greatest.