For a sample size of 28, what will be the the t-score at point M if the area to the right of the point is 95%?

33 credit card holders are selected at random. For each, their current credit card balance is recorded. The average for these 33 people is = $600. Assume that the current balance of all credit card holders follows a normal distribution with unknown mean H, and that a 80% confidence interval for ur is found to be $600 33.7. What was the standard deviation o of the population?

A freight elevator designed to carry 25 boxes for Omaha Furnitures, Inc is considered to be overloaded if the total weight exceeds 2,800 pounds. Suppose that the weights of the boxes is normally distributed with a mean of 106 pounds and a standard deviation of 27 pounds. If the boxes are typically assigned randomly to elevator, what is the probability that the elevator will be overloaded?

A random sample of 139 citizens of Greenville showed the average taxes paid by a citizen was 12,819 dollars. Assume standard deviation o to be 1,231.5 dollars, the margin of error for a 95% confidence interval for the mean is