What price do farmers get for their watermelon crops? In the third week of July, a random sample of43farming regions gave a sample mean of= $6.88per 100 pounds of watermelon. Assume thatis known to be$1.98per 100 pounds.

(b)Find the sample size necessary for a 90% confidence level with maximal error of estimateE=0.39for the mean price per 100 pounds of watermelon. (Enter a number. Round up to the nearest whole number.)

(c)A farm brings 15 tons of watermelon to market. Find a 90% confidence interval for the population mean cash value of this crop (in dollars). What is the margin of error (in dollars)?Hint:1 ton is 2000 pounds. (For each answer, enter a number. Round your answers to two decimal places.)

lower limit$

upper limit$

margin of error$