1. The arithmetic mean age of the first group of 80 students is
10 years and that of second group of 20 students is 15 years.
Find the arithmetic mean age of all the students.
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Answer:
15 years
Step-by-step explanation:
Mean of first 80 students = 15 years
Total age = 80×15 years.
= 1200 years.
Mean of 2nd 20 students = 15 years.
Total age of 20 students = 20×15
= 300 years .
Total number of students = 80+20
=100
Total age of 100 students
= ( 1200 + 300 )
= 1500
Mean age of 100 students
= 1500 years / 100
= 15 years
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