6. A leaky valve on the water meter overcharges the residents for one gallon of water every 3 1/3 months.
The overcharged amount w varies directly with
time t. Find the equation that models this direct
variation. How many months it will take for the
residents to be overcharged for 9 gallons of water?

A. w = 3/10 t; 2 7/10 months

B. w= 3/10 t; 30 months

C. w= 10/3 t; 30 months

D. w= 10/3 t; 2 7/10 months

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?