MrSkiebert Gave the Same Physics Test to Each of His

Multiple Choice

Mr.Skiebert gave the same physics test to each of his three senior classes.Analysis of the data revealed the following descriptive statistics: $$\begin{array} { | l | c | c | } \hline \text { Class } & \text { Mean } & \text { Standard Deviation } \\\hline \hline \text { One } & 59 & 7.5 \\\hline \text { Two } & 68 & 6.2 \\\hline \text { Three } & 62 & 6.9 \\\hline\end{array}$$
Compared to the two other classes,Mr.Skiebert can infer that students in Class One exhibit

A) a narrow distribution of scores.
B) greater variability.
C) higher central tendency.
D) lower variability.