The following data represent the high temperatures for the first 20 days in March in Jacksonville, Florida: 52, 50, 49, 60, 67, 56, 60, 62, 67, 65, 61, 64, 68, 70, 71, 72, 78, 80, 83, 86

a) Calculate the mean. x = s = 10.4

b) List the temperatures that are the most statistically significant (those that are within one standard deviation of the mean).

c) List any temperatures that are not statistically significant (those that are more than two standard deviations from the mean). If there are non, say so.