The MyTunes song app sellis music downloads. Over the past few years, the service has lowered its prices. The table shows the price per song and the number of songs downloaded per day at that price.
Number of Downloads (In thousands)
1212
1587
Price per song
$0.89
$0.79
$0.69
$0.59
$0.49
$0.39
1704
1877
1947
2054
a. Describe the correlation.
b. Find the line of best fit.
c. Determine the number of downloads expected when the cost is $0.53

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?