what is the second part of this question What is the second

What is the second part of this question The graph of a normal curve is given. Use the graph to identify the value of mu and sigma The value of mu is The value of sigma is

Solution

Value of mean = centerred dots = 530

Given that the mean (u) of a normal probability distribution is 530 and the
(a) About 68% of the area under the normal curve is within one standard deviation of the mean. i.e.
(u ± 1s.d)

(u ± 1s.d) = 532

530 ± 1s.d = 532 => s.d = 532- 530 = 2