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Question
The mean of 10 numbers is 55. If one number is excluded, their mean becomes 50, the excluded number is:
The mean of 10 numbers is 55. If one number is excluded, their mean becomes 50, the excluded number is:
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Solution
The correct option is B 100
The sum of 10 numbers = 10 x 55 = 550
The sum of 9 numbers = 9 x 50 = 450
Therefore, excluded number = 550 - 450 = 100
100
The sum of 10 numbers = 10 x 55 = 550
The sum of 9 numbers = 9 x 50 = 450
Therefore, excluded number = 550 - 450 = 100
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