8. In this question, you will be assessed on the quality of your organisation, communication and accuracy in writing
AB is the diameter of a circle, centre 0, with radius OA : 42cm
ABCD is a square
C
+
A
B
4.2 cm
Diagram nor drawn to scale
Calculate the area of the shaded region
You must show al your working
5- 2 OCW)

Assume that females have pulse rates that are normally distributed with a mean of mu equals 72.0 beats per minute and a standard deviation of sigma equals 12.5 beats per minute. complete parts (a) through (c) below. a. if 1 adult female is randomly selected, find the probability that her pulse rate is between 65 beats per minute and 79 beats per minute. the probability is? b. if 16 adult females are randomly selected, find the probability that they have pulse rates with a mean between 65 beats per minute and 79 beats per minute. the probability is? c. why can the normal distribution be used in part (b), even though the sample size does not exceed 30?