The a. p. statistics exam consists of a multiple-choice section in which each question has five choices. sara estimates that she has a 75% chance of knowing each question. if she does not know the answer, she will randomly guess.

a) what is the probability of sara getting a question correct?
b) the a. p. exam has 40 questions, how many might sara expect to get correct?

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?