Question

The average of the 100 results is 13, that of the first 40 is 12 and that of next 50 is 122, Find the average of the last 10

Answer 1

Answer:

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Step-by-step explanation:

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Answer 2

Answer:

Average of last 10 is 22.

Given:

The average of the 100 results is 13, that of the first 40 is 12 and that of next 50 is 12. (cannot be 122)

To find:

The average of the last 10

Solution:

Total sum of 100 results = 13 $\times$ 100 = 1300.

Sum of 40 results = 40$\times$  12 = 480

The sum of next 50 results = 50$\times$ 12 = 600

The sum of last 10 = 1300 – (600 + 480)

= 1300 – 1080

Sum of last 10 = 220

Average of last 10 = 22.

Result:

Average of last 10 = 22.