JEE Main · MathematicsHard
The mean of observations is and their standard deviation is . If each observation is increased by , then the new mean and standard deviation are respectively:
- A.$54, 9$
- B.$54, 5$
- C.$50, 9$
- D.$50, 5$
Show correct answer & step-by-step solution
Correct answer: B — $54, 5$
Solution
If , then . The standard deviation is invariant under translation, so .
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