Seven students of a group get 20, 20, 20, 20, 20, 20, 20 marks in a te – InterviewSolution

1.	Seven students of a group get 20, 20, 20, 20, 20, 20, 20 marks in a test of 25 marks. What is the standard deviation of their marks?
Answer» Observations of marks are 20, 20, 20, 20, 20, 20, 20. All the observations are of same magnitude. Hence, standard deviation marks s will be zero, i.e., s = 0.

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