Multiple choice

Marks obtained by four students are :25,35,45,55.The average deviations from the mean is

  1. 10

  2. 9

  3. 7

  4. none of these
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A Correct answer
Explanation

Mean = (25+35+45+55)/4 = 160/4 = 40. Deviations from mean: |25-40|=15, |35-40|=5, |45-40|=5, |55-40|=15. Average deviation = (15+5+5+15)/4 = 40/4 = 10.

AI explanation

The mean of the marks is calculated as 25 plus 35 plus 45 plus 55 divided by 4, which equals 40. The absolute deviations of each mark from this mean are 15, 5, 5 and 15, which sum to 40. We divide this sum by the total number of students to get the average deviation: 40 divided by 4 equals 10.

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