Solution:
Mean of 10 numbers = 13
Sum of numbers = 13×10 = 130
Mean of remaining 15 numbers = 18
Sum of numbers = 15×18 = 270
Sum of all numbers = 130+270 = 400
Mean = sum of numbers/25 = 400/25 = 16
Hence the mean of 25 numbers is 16.
Find the mean of 25 given numbers when the mean of 10 of them is 13 and the mean of the remaining numbers is 18.
Find the mean of 25 given numbers when the mean of 10 of them is 13 and the mean of the remaining numbers is 18.