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

Solution:

Given, the mean of three numbers is 10.

The mean of the other four numbers is 12.

We have to find the mean of all the numbers.

We know, mean = sum of observations/number of observations

Sum of first 3 numbers = 10(3) = 30

Sum of other 4 numbers = 12(4) = 48

Sum of 7 numbers = 30 + 48

= 78

Number of observations = 7

Mean = 78/7

= 11.14

Therefore, the mean is 11.14

✦ Try This: The mean of the four numbers is 16. The mean of the other four numbers is 18. Find the mean of all the numbers.

☛ Also Check: NCERT Solutions for Class 7 Maths Chapter 3

NCERT Exemplar Class 7 Maths Chapter 3 Problem 67

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

Summary:

The mean of three numbers is 10. The mean of the other four numbers is 12. The mean of all the numbers is 11.14

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