Question

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

Answer 1

Answer:

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

7

78

=11.15 .

Answer 2

Answer:

mean=frequency/total no of observation

Step-by-step explanation:

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