0. A telemarketer found that there was a 0% chance of a sale from his phone solicitations. If 0000 telephone calls were made, use the normal approximation to the binomial distribution to find the probabilities that  a) at most 00 sales were made;  b) more than 00 sales were made;  c) exactly 00 sales were made  0. The lengths of pregnancies of humans are normally distributed with a mean of 000 days and a standard deviation of 00 days. If 000 women are randomly selected,  a) find the mean and standard of error of the mean of the sampling distribution of sample means;  b) What happens to the mean and standard deviation of the distribution of sample means when the sample size is increased to 000?  c) Find the probability that the mean length of pregnancy, X (x bar)for a random sample of 000 women is more than 000 days  0. Commonly used practice of airline companies is to sell more tickets than actual seats to a particular flight because customers who buy tickets do not always show up for the flight. Suppose that the percentage of no shows at flight time is 0%. For a particular flight with 000 seats, a total of 000 tickets were sold. What is the probability that the airline overbooked this flight?