Oranges are selected at random from a large shipment that just arrived. The sample is taken to estimate the size (circumference, in inches) of the oranges. The sample data are summarized as follows: n = 100 ∑x = 878.2, and ∑(x - x)2 = 49.91
a. Determine the sample mean and standard deviation.
b. What is the point estimate for m, the mean circumference of all oranges in the shipment?
c. Find the 95% confidence interval for m.