suppose number of boys = b

10.30 * (20+b) = 20*9.70 + 11.1*b

Solve for b

Aamir W.

asked • 10/15/17a) A survey of park showed an average expenditure of Rs. 10.30. If for 20 girls the average expenditure was Rs.9.70 and Rs. 11.1 for the boys. Find the number of boys.

b) A computer calculated a mean of 42 from 20 observations. It was later discovered at the time of checking that he had copied down values as 45 and 38, where as the correct values were 35 and 58.Find the correct value of mean.

b) A computer calculated a mean of 42 from 20 observations. It was later discovered at the time of checking that he had copied down values as 45 and 38, where as the correct values were 35 and 58.Find the correct value of mean.

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suppose number of boys = b

10.30 * (20+b) = 20*9.70 + 11.1*b

Solve for b

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