alanforde800Maximus wrote:Ques)The average (arithmetic mean) of 16 students first quiz scores in a difficult English class is 62.5. When one student
dropped the class, the average of the remaining scores increased to 64.0. What is the quiz score of the student who dropped the class?
a) 10
b) 25
c) 40
d) 55
e) 70
Total for all 16 students = (number of students)(average per student) = (16)(62.5) = 1000.
After one student drops the class, the total for the remaining 15 students = (number of students)(average per student) = (15)(64) = 960.
Score for the student who dropped the class = (total for all 16 students) - (total for the remaining 15 students) = 1000-960 = 40.
The correct answer is
C.
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