Question

8.The mean of three numbers is 10. The mean of other four numbers is 12. Find the mean of all the Numbers.​

Answer 1

Answer:

11.15

Step-by-step explanation:

Given, Mean of 3 no's =10.

Then, total of 3 no's is =10×3=30.

Also, Mean of other 4 no's is 12.

Then, Total of 4 no's is =12×4=48.

∴Total  of 4+3=7 numbers is 48+30=78.

We know, Mean is given by,

Mean=  Total number of elements /Sum of the elements

​ Hence, mean of 7 numbers is   78/7

​                                                    =11.15 .