Answers

  • Brainly User
2015-10-10T11:42:44+05:30
Average of 'n' things isĀ \frac{1}{n}(\Sigma_1^n x_i).
Then, average of 16 students = 15 means (sum of ages of al students)/16 = 15.
sum of ages - 18 = 16(15),
new average = 16.
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2015-10-11T12:18:57+05:30
The total puplation is =16*15 which is 240

now that one boy of 18 years left subtract from 240 which is 240-18 =222

now average of 15 students is 222 divide by 15 =14.8

the answer is =14.8
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