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The mean age of 40 students is 16 years and the mean age of another group of 60 students is 20 years. The mean age of all the 100 students is
- A16.8 years.
- B18 years,
- C18.4 years.
- D18.8 years.
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CCommunity
Sum of the ages of 40 students
= 16 × 40 = 640 years
Sum of the ages of other 60 students
= 60 × 20 = 1200 years
Sum of the ages of all 100 students
= 640 + 1200 = 1840 years
Therefore , The mean age of all 100 students
= 1840/100
= 184/10 = 18.4 years
= 16 × 40 = 640 years
Sum of the ages of other 60 students
= 60 × 20 = 1200 years
Sum of the ages of all 100 students
= 640 + 1200 = 1840 years
Therefore , The mean age of all 100 students
= 1840/100
= 184/10 = 18.4 years