The average score for a class of 30 students was 75.The 20 male students in the class averaged 70.The 10 female students in the class averaged
A) 75
B) 85
C) 60
D) 70
E) 80

Question

Quizplus · Accepted Answer

We can use the formula: 
Total score = Average score x Number of students

Total score for the entire class = 75 x 30 = 2250

Total score for the male students = 70 x 20 = 1400

Total score for the female students = Total score for the class - Total score for the male students 
= 2250 - 1400 = 850

Average score for the female students = Total score for the female students / Number of female students 
= 850 / 10 = 85

Therefore, the best choice is B, with an average score of 85 for the female students.

The Average Score for a Class of 30 Students Was