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For a list of 20 numbers, the mean is 18.
If 4 is added to each of the 20 numbers and then the result is divided by 2,
what is the mean of the final set of numbers?

Class 7Arithmetic MeanData Handling
  • A12
  • B22
  • C10
  • D11

Step-by-Step Solution

Adding 4 to each raises the mean to 18 + 4 = 22. Dividing each by 2 halves the mean: 22 / 2 = 11.
Answer: D) 11

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