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what price do farmers get for their watermelon crops? In the third week oF July. a landom sample oF 41 farming regions gave a sample mean oF ; = $6.88 per 100 pounds of watermelon. Assume that 0' is known to be $1.92 per 100 pounds. (a) Find a 90% confidence interval For the population mean price (per 100 pounds) that farmers ln this region get for their watermelon crop (in dollars]. what is the margin of error {in dollars)? [For each answer, enter a number. Round your answers to two decimal places.) wwmmriEZZZZI upperlimit $ margin oFerror $ (b) Find the sample size necessary For a 90% confidence level wiH'l maximal error oF estimate E = 0.3]. for the mean price per 100 pounds of watermelon. [Enter a number. Round up to the nearest whole number.) E::::jemmewM (c) A iarm trings 15 tons of watermelon to marloet. Flnd a 90% condence interval for le population mean cash value of this crop (in dollars). What is the margin of error (in dollars)? Hint: 1 ton is 2000 pounds. (For eacl. answer. enter a number. Round your answers pp two decimal places.) lower limit $ uplper limit $ manem.c[::::3