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Step deviation method - class-IX
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The mean weight of 9 students is 24 kg. If one more student is joined in the group the mean is unaltered, then the weight of the 10th student is
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A
25 kg
💡 Explanation:
The sum of weights of the 9 students = $25\times 9=225$ kg
If one more student is joined in the group, then total number of students is 10, and the mean isn 25.
The sum of weights of the 10 students is $25\times 10=250$ kg
The weight of the tenth student is $250-225=25$ kg