NDA 2018 Mathematics question
Consider the following statements : 1. If 10 is added to each entry on a list, then the average increases by 10. 2. If 10 is added to each entry on a list, then the standard deviation increases by 10. 3. If each entry on a list is doubled, then the average doubles. Which of the above statements are correct?
Answer: (C)
Solution
Adding a constant to every entry adds the same constant to the mean (1 correct) but leaves the deviations from the mean, and
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