Question

52. The mean of 25. numbers, if the
mean of 15 of them is 18 and the
mean of the remaining numbers is 13
is​

Answer 1

Step-by-step explanation:

mean = sum/no. of values

sum= mean × no. of values

mean of 15 no.s = 18

sum of 15 no.s = 18×15 = 270

mean of 10 no.s =13

sum = 13×10=130

sum of 25 no.s = 270+130=400

mean = 400/25= 16