Question

The table displays the scores of students on a recent exam. Find the mean of the

scores to the nearest 10th.
Score Number of Students
70
7
75
5
80
4
85
1
90
6

Answer 1

78.7

Explanation:

To find the mean, we can do the sum of all scores divided by the total amount of scores.

We see that there are 7 scores of 70, and 70*7=490.

We see that there are 5 scores of 75, and 75*5=375.

We see that there are 4 scores of 80, and 80*4=320.

We see that there is 1 score of 85, and 85*1=85.

We see that there are 6 scores of 90, and 90*6=540.

Now we can do
`(490+375+320+85+540)/(7+5+4+1+6) =(1810)/(23) =78.7`