Question

the mean of 10 numbers is 20. If one of the number is excluded,their mean is 17. The excluded number is?
a) 47
b) 57
c) 77​

Answer 1

ANSWER...................,

The mean of 10 number=20

The sum of 10 number=10×20=200

If one number is excluded

Then mean of 9 number=17

Sum of 9 number=9×17=153

∴excluded number=200−153=47

So, option a) is the correct .

Answer 2

Answer:

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