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
65 4
70 9
75 2
80 7
85 2
90 4
95 5

Explanation:

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

$65\times4 + 70\times9+75\times2 + 80\times7+85\times2+90\times4+95\times5=260 + 630+150 + 560+170+360+475 = 2505$

Step2: Calculate the total number of students

$4 + 9+2 + 7+2+4+5=33$

Step3: Calculate the mean

$\text{Mean}=\frac{2505}{33}\approx75.9$

Answer:

$75.9$