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
85	6
90	7
95	2
100	6

answer

Explanation:

Step1: Calculate the sum of the products of scores and number of students

$80\times1 + 85\times6+90\times7 + 95\times2+100\times6$
$=80+510 + 630+190+600$
$=2010$

Step2: Calculate the total number of students

$1 + 6+7+2+6=22$

Step3: Calculate the mean

$\frac{2010}{22}\approx91.4$

Answer:

$91.4$