What price do farmers get for their watermelon crops? In the third week of July, a random sample of 41 farming regions gave a sample mean of x = $6.88 per 10! pounds of watermelon. Assume that o" is known to be $1.94 per 100 pounds. {a} Find a 90% confidence interval for the population mean price (per 100 pounds) that farmers in 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.) lower limit 1: upper limit it margin of error 1' (b) Find the sample size necessary for a 90% condence level with maximal error of estimate E = 0.39 for the mean price per 100 pounds of watermelon. (Enter a number. Round up to the nearest whole number.) [: farming regions {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 as upper limit $ margin oferror $