What price do farmers get for their watermelon crops? In the third week of July, a random sample of40farming regions gave a sample mean of= $6.88per 100 pounds of watermelon. Assume thatis known to be$1.96per 100 pounds.

(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