Question

A spelling quiz by 20 boys. The mean score for the girls is 8.25 and the mean score for the ken 12 girls and score for all of boys the following, which is closest to the mean is 7.3. Of the students?

(A) 7.66
(B) 7.71
(C) 7.76
(D) 7.78
(E) 7.89

Answer 1

(A) 7.66

Explanation:

`Mean=\frac{\text{Total Score}}{\text{Number of Scores}}`

Total Score= Mean X Number of Scores

For the girls, Mean Score=8.25, Number of Scores = 12

• Total Score=8.25 X 12=99

For the boys, Mean Score=7.3, Number of Scores = 20

• Total Score=7.3 X 20=146

Total Score for all Students = 99+146=245

Total number of students = 20+12=32

`\text{Mean Score of all the students}=\frac{\text{Total Score}}{\text{Number of Scores}}\\\text{Mean Score of all the students}=(245)/(32)=7.66`