Question

the graph represents the distribution of the number of questions answered correctly on a 50 - question math test. what is the standard deviation of the data? 4 12 24 8

Explanation:

Step1: Recall normal - distribution property

In a normal distribution, about 68% of data lies within 1 standard - deviation of the mean. If we assume the mean is around 36 and one - standard deviation intervals, we can estimate. The distance from 36 to 40 (or 36 to 32) is likely 1 standard deviation.

Step2: Calculate the value

$40 - 36=4$.

Answer:

4