Multiple choice

If the sum of the observations of $50$ observations from $30$ is $50$, then the mean of these observations is:

  1. $50$
  2. $30$
  3. $31$
  4. $51$
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C Correct answer
AI explanation

The sum of the deviations of all observations from 30 is given as 50, meaning the total sum of the observations exceeds 30 for each of the 50 items by an overall amount of 50. The total sum of the observations is 50 times 30 plus 50, which equals 1550. Dividing this total sum by the 50 observations gives a mean of 31.

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