Question

the graph illustrates the \distribution of statistics grades\. round all values to whole numbers

what is the mean of this normal distribution?

μ =

what is the approximate standard deviation of this normal distribution?

σ =

Explanation:

Step1: Recall property of normal - distribution mean

In a normal distribution, the mean is at the center of the symmetric curve. Here, the center value is 73.
$\mu = 73$

Step2: Recall property of standard - deviation in normal distribution

In a normal distribution, the points of inflection are approximately one standard - deviation away from the mean. The points of inflection seem to be at 63 and 83. So, $\sigma=83 - 73=10$

Answer:

$\mu = 73$
$\sigma = 10$