Answer
a. $\mu=120, \sigma=20$
b. $\mu=15, \sigma=2.5$
c. $\mu=30, \sigma=5$
Work Step by Step
The center of the curve is the mean, the difference between the mean and the first left or right vertical line is the standard deviation.
a. $\mu=120, \sigma=140-120=20$
b. $\mu=15, \sigma=17.5-15=2.5$
c. $\mu=30, \sigma=35-30=5$
