i need help answering these questions please

4. What price do farmers get for their watermelon crops? In the third week of July, a random sample of 40 farming regions gave a mean of $6.88 per 100 pounds of watermelon. Based on previous studies, assume the population standard deviation is known to be $1.92 per 100 pounds of watermelon. a. Find a 95% confidence interval for the population mean price (per 100lbs) farmers in this region get for their watermelon crop. Interpret your results. (5pts) b. Find a 99% confidence interval for the population mean price (per 100lbs) farmers in this region get for their watermelon crop. Interpret your results. (5pts) c. Which confidence interval is wider and why? Explain. (2pts)