Question

Out of 25 numbers, it is given that the mean of 15 numbers is 18 and that of the rest is 13. Find the mean of 25 numbers.

Answer 1

Answer:

16

Step-by-step explanation:

Let numbers be a1,a2....,a25

Then a1+a2+....+a15 = 15×18= 270

Then a16+a17+...+a25 = 10×13 = 130

Sum of all numbers = a1+a2+...+a25 = 400

Mean of all nunbers = 400/25 = 16