What price do farmers get for their watermelon crops?I In the third week of July, 3 random sample of 42 farming regions gave a sample mean of E = $6.88 per 100 pounds of watermelon. Assume that a is known to be $1.94 per 100 pounds. {a) Find a 90% condence 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 answerr enter a number. Round your answers to two decimal places.) lower limit $ y up per limit $ X margin of error $ x {b) Find the sample size necessary.r for a 90% condence level with maximal error of estimate E = 0.25 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% condence 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 $ up per limit $ margin of error it |:|