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2015-10-16T16:02:33+05:30

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The removed number is 83. Sum of observations of the set with 10 numbers= 65 ×10=650. Sum of observations of the set with 9 numbers=63×9 =567. The removed number=sum of observations of the set with 10 numbers - sum of observations of the set with 9 numbers= 650-567 =83. Hope this helps you :))
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2015-10-16T16:32:02+05:30
Mean of 10 numbers = 65
Sum of the numbers = 65×10 = 650

when one number is removed,
number of numbers = 9
their mean = 63
sum = 63×9 = 567

The removed number = 650 - 567 = 83
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