The mean weight of 8 numbers is 15.If each number is multiplied by 2, what will be the new mean ?
Mean weight of 8 numbers = 15
By multiplying each number by 2,then the average will be=15×2=30
∴ New average=30
The mean of 15 numbers is 27. If each number is multiplied by 4, what will be the mean of the new numbers?