Question

the mean of 3 different number is 5 and the mean of 4 different number is 12.find the mean of their7 numbers.​

Answer 1

mean of 7 different numbers is

[3(5)+4(12)]/7

Hence mean of 7 different numbers is 63/9 = 9 is ur answer

Answer 2

The mean of their 7 numbers is 9

Given:

The mean of 3 different number is 5 and

The mean of 4 different number is 12.

To find:

The mean of the seven numbers.

Solution:

Step 1 of 2:

The mean of 3 different number is 5

Then, the total of 3 numbers is 3 × 5 = 15

The mean of 4 different number is 12

Then, the total of 4 numbers is 4 × 12 = 48

Step 2 of 2:

Mean = Sum of the elements / Total number of elements

Total number of elements is 3 + 4 = 7

Sum of the elements is 15 + 48 = 63

Mean = $\frac{63}{7}$

Mean = 9

The mean of their 7 numbers is 9