equal to 175.0 centimeters?

How to do b and c?

3) A national Retail Foundation survey found households intended to spend an average of $649 during December holiday season. Assume that the survey included 600 households and that sample standard deviation was $175. a) Construct the 95% confidence interval for the population mean Plus or...

A bin contains 77 light bulbs of which 10 are defective. If 4 light bulbs are randomly selected from the bin with replacement. Find the probability that all the bulbs selected are good ones.

For a normal probability distribution, about 95 percent of the area under normal curve is within plus and minus two standard deviations of the mean and practically all (99.73 percent) of the area under the normal curve is within three standard deviations of the mean

The following is the heights of father (X), in inches and their sons (Y): X 65 66 67 67 68 69 70 72 Y 67 68 65 68 72 72 69 71 Obtain the equation of the line of regression of X an Y. Also find estimate of X for Y = 70

Q1. A small bank has two cashiers dealing with customers wanting to withdraw or deposit cash. For each cashier, the time to deal with a customer is a random variable having a normal distribution with mean 150s and standard deviation 45s. A. Find the probability that the time taken for a randomly...

statistical quality control

Find the minimum sample size your should use to assure that your estimate of p will be within the required margin of error around the population p. Margin of error: 0.09; confidence level: 95%; from a prior study, p is estimated by the decimal equivalent of 87%

A decade-old study found that the proportion, p, of high school seniors who believed that "getting rich" was an important personal goal was 70%. A researcher decides to test whether or not that percentage still stands. He finds that, among the 230 high school seniors in his...