Question

the mean of 7 numbers is 30.if two numbers are excluded,their mean becomes 25.find the sum of the excluded numbers​

Answer 1

Mean of 7 numbers = 30

Sum of the 7 numbers = 7*30 = 210

When 2 numbers are excluded, the mean becomes 25.

ie, mean of 5 numbers = 25

Sum of the 5 numbers = 5*25 = 125

Sum of the excluded numbers = 210 - 125 = 85