Ada's professor tells her class that the average score on the last test was 72 points.Ada wants to know if most students actually scored near 72,or if the grades were more spread out,with many students doing much better or worse than a 72.What statistic could Ada ask her professor to calculate to help answer her question?
A)standard deviation
B)median
C)mode
D)correlation coefficient

Question

Quizplus · Accepted Answer

Standard deviation measures the spread of data from the average, so calculating the standard deviation can help Ada determine if the grades were more spread out or clustered around the average of 72. The median and mode may also provide some information about the distribution of grades, but they are less useful than the standard deviation for determining the spread of data. The correlation coefficient is not relevant for this question, as it measures the strength and direction of a relationship between two variables, and there is only one variable (the test scores) in this scenario.

Ada's Professor Tells Her Class That the Average Score on the Last