Susan wants to save $800 to buy a tv. she saves $19 each week. the amount, a (in dollars), that she still needs after w weeks is given by the following function
a(w)=800-19w
how much money does susan still need after 5 weeks ?
if susan still needs $349, how many weeks has she been saving?

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?