The following data represents the mean August temperature ( Fahrenheit) in 20 us cities: 64, 64, 68, 69, 70, 71, 71, 72, 74, 75,76,76,76, 77, 81, 82, 82, 83, 85, 92 .
a) construct a split-stem polt.
b) What percentage of the 20 cities have a mean August temperature in the 80's?