1.The calorie content of most protein bars is known to vary normally with calories.A sample of 50 bars has a mean calorie content of 253.1 calories.

a)Give a 95% confidence interval for the mean caloric content of all such protein bars.

b)sentence that explains the interval from part a), using the numbers from part a).

c)The vending machine claims that the average calories in these bars is less than 255.Test this claim, using a significance level of .05.