Researchers measured the data speeds for a particular smartphone carrier at 50 airports. The highest speed measured was 72.1 Mbps. The complete list of 50 data speeds has a mean of x=15.82 Mbps and a standard deviation of s=21.61 Mbps. a. What is the difference between​ carrier's highest data speed and the mean of all 50 data​ speeds?
b. How many standard deviations is that​ [the difference found in part​ (a)]?
c. Convert the​ carrier's highest data speed to a z score.
d. If we consider data speeds that convert to z scores between 2 and 2 to be neither significantly low nor significantly​ high, is the​ carrier's highest data speed​ significant?