I need help with stat homework

A national chain of department stores ranks its 1,250,000 salespeople by the monetary value of their sales. Dan's sales are at the 82nd percentile. Jane's sales are at the 21st percentile. (a) Which of the following must be true about Dan's sales? X ? Dan had sales higher in value than about 18% of the salespeople. About 18% of the salespeople had sales higher in value than Dan. The value of Dan's sales were about 82% of the chain's total. O The value of Dan's sales were about 18% of the chain's total. (b) Which of the following must be true about Dan's and Jane's sales? Dan's sales were higher in value than Jane's sales. Both Dan and Jane had sales higher in value than the median. The value of Dan's sales were $6100 more than Jane's. O The values of both Dan's and Jane's sales were in the bottom half of all of the salespeople.The annual rainfall in a certain region is modeled using the normal distribution shown below. The mean of the distribution is 36.5 cm and the standard deviation is 5.2 cm. In the figure, I is a number along the axis and is under the highest part of the curve. And, U and Ware numbers along the axis that are each the same distance away from V. Use the empirical rule to choose the best value for the percentage of the area under the curve that is shaded, and find the values of U, V, and W. Percentage of total area shaded: (Choose one) 68% 95% 99.7% 20 25 0 30 35 V 40 45 W 50 55 Rainfall (in cm) U = [ V = W = [ X ?V At one university, the mean distance commuted to campus by students is 18.0 miles, with a standard deviation of 4.1 miles. Suppose that the commute distances are normally distributed. Complete the following statements. (a) Approximately 95% of the students have commute distances between [I miles and I] miles. (b) Approximately ? of the students have commute distances between 5.7 miles and 30.3 miles