Question

67. The mean of three numbers is 10. The mean of other four
is 12. Find the mean of all the mumbers,​

Answer 1

Answer:

Step-by-step explanation:

The mean of three numbers =10

So , Sum of three numbers =3×10 = 30

The mean of four numbers = 12

So, Sum of four numbers = 4×12 =48

Sum of seven numbers =30+48 =78

Mean of seven numbers =78/7 =11.14 (approximately )