Question

find the mean of 25 numbers,it being given that the mean of 15 of them is 18 and the mean of remaining ones is 13​

Answer 1

Step-by-step explanation:

Sum of 15 numbers/15=18; Sum of 15 numbers = 18×15=270; Sum of 10 numbers/10= 13; Sum of 10 numbers= 13×10=130; Mean= Sum of 25 observations/25=130+270/25=400/25=16