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4.5 Statistical distributions (A-level only)

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Question 60

A variable X X\,X is normally distributed. Given P(X<52)=0.2P(X < 52) = 0.2P(X<52)=0.2 and P(X>60)=0.3P(X > 60) = 0.3P(X>60)=0.3

Find the mean and standard deviation of XXX.

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4.5 Statistical distributions (A-level only) Questions

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