Question

2
c)
if the mean of 10 numbers is 7 and mean of 15 numbers is 12. then the combined means
b) 12
(a17
c) 10​

Answer 1

Answer:

sum of 10 numbers=10×7=70

sum of 15 numbers= 15×12=180

sum of all 25 numbers= 250

combined mean =250/25=10 that is option c