Question 2 10 pts In a study of 40 six-year old boys, the mean weight was 46 lb with a standard deviation of 4.1 lb. . Find the 90% confidence interval for the mean weight of six-year old boys. Use Za/2 = 1.645. . Enter the two endpoints of the confidence interval, rounded to one decimal place. . Include all details of your work, together with indications of whether you used tables or the calculator in your written work. Table Answers: . Lower endpoint: . Upper endpoint: Show all steps in the calculation. Just listing the confidence interval will not be sufficient for full credit. Submit the details of your solution with your written work