19. The heights, in inches, of players on a basketball team are: 57, 63, 68, 72, 50, 63, 65, 69, 73, 71, 60 The heights, in inches, of players on a soccer team are: 49, 53, 52, 52, 57, 61, 55, 61, 59, 61, 50, 50, 51, 62, 50, 57 What is the difference in mean height between the basketball team and soccer team?

Mean is the average in a give set of data. Mean can be calculated by adding all numbers in the set divided by the number of values in the set of data. To get the mean of the height of the basketball team, add  57, 63, 68, 72, 50, 63, 65, 69, 73, 71and 60 divided by 11 since there are 11 values in the data set. 
> 57+63+68+ 72+50+ 63+ 65+ 69+ 73+ 71+ 60 / 11 = mean of basketball team's height
> 711/11= mean of basketball team's height
> 64.64= mean of basketball team's height
64.64 inches is the mean of the basketball team's height.
To get the mean of the soccer team, add 49, 53, 52, 52, 57, 61, 55, 61, 59, 61, 50, 50, 51, 62, 50 and 57 divided by 16 since there are 16 values in the data set.
> 49+ 53+52+ 52+ 57+ 61+ 55+ 61+ 59+ 61+ 50+ 50+ 51+ 62+ 50+57/16=mean of soccer team's height
> 880/16=mean of soccer team's height
> 55 =mean of soccer team's height
55 inches is the mean of the soccer team's height.
Subtract the mean of basketball team's height by the mean of soccer team's height to get difference in mean height between the basketball team and soccer team.
> 64.64 inches-55 inches
> 9.64 inches.
The difference of the mean of basketball and soccer team's height is 9.64 inches.