The line plot below shows the number of hours each person in Mr. Finley's class studied for an exam. What is the mean of the data in the graph?

Answer 1

Without seeing the line plot, I can only answer you in theory. The mean is the average which is calculated by adding up all the values and dividing by the number of values.

X X

X X X X

X X X X

0 1 2 3

You can calculate this as 0 + 0 + 0 + 1 + 1 + 2 + 2 + 3 + 3 + 3 = 15.

Mean is 15/10 = 1.5 hours

You can also calculate this as 3(0) + 2(1) + 2(2) + 3(3) = 0 + 2 + 4 + 9 = 15

NOTE: You must include the # of students who did not study. n = 10 not 7!