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The arithmetic mean of 80 numbers is 55. If two numbers is namely 250 and 850 are removed, what is the arithmetic mean of the remaining numbers
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The arithmatic mean of 80 numbers =X/80=55

Where X is the sum of the 80 numbers

X=80×55= 4400.

The arithmatic mean after removing the two numbers=

(X -250 -850)/78=(4400 - 250 -850)/78= 42.3

Notice that, 78 is the count of the numbers after removing two numbers.
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