A cell phone plan costs $30.90 per month for 500 minutes of talk time. It costs an additional $0.07 per minute for each minute over 500 minutes. To get e-mail access, it costs 30% of the price for 500 minutes of talk time. Your bill, which includes e-mail, is the same each month for 5 months. The total cost for all 5 months is $230.95. Write and solve an equation to find the number of minutes of talk time you use each month.

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?