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4.5 Statistical distributions (A-level only)

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Question 43

The time, T T\,T minutes, taken for a student to complete a logic puzzle follows a normal distribution. Data shows that 25% of students complete the puzzle in less than 25 minutes, while 15% take more than 45 minutes.

Find the mean and standard deviation of the time taken to complete the puzzle.

[6]

4.5 Statistical distributions (A-level only) Questions

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