i need help solving this problem

What price do farmers get for their watermelon crops? In the third week of July, a random sample of 40 farming regions gave a sample mean of x = $6.88 per 100 pounds of watermelon. Assume the o is known to be $1.92 per 100 pounds. (Reference: Agricultural Statistics, U.S. Department of Agriculture). A. Find a 90% confidence interval for the population mean price (per 100 pounds) that farmers in this region get for their watermelon crop. 1. What is the critical value that corresponds to 90%? Zo.90 = Il. What is the margin of error? Round to the nearest penny. E = Ill. Complete the confidence interval. Round to the nearest penny.