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19 (i) The random variable X is normally distributed. The mean is twice the standard deviation. It is given that P(X> 5.2)=0.9. Find the

19 (i) The random variable X is normally distributed. The mean is twice the standard deviation. It is given that P(X> 5.2)=0.9. Find the standard deviation. (ii) A normal distribution has mean and standard deviation . If 800 observations are taken from this distribution, how many would you expect to be between - and + o?

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