. Al Fishhaber is the owner of Al's Marathon gas station. Al would like to estimate the mean number of gallons of gasoline sold to his customers. From his records he selects a sample of 60 sales and finds that the mean number gallons sold is 8.60 and the standard deviation is 2.30 gallons. In the question about Al's Marathon we determined the mean number of gallons of gasoline purchased by Al's customers. We are also interested in the proportion of women in the population that pump their own gas. He surveyed 100 women and found that 80 indicated that they pumped their own gas.

a. What is the point of estimate of the proportion of women in the population that pump their own gasoline?

b. Construct a 95% confidence interval for the proportion of women who pump their own gas.

c. Interpret the confidence interval.