Question: 21 The random variable X has a normal distribution with mean 4.5. It is given that P(X>5.5) 0.0465 (see diagram). 4.5 5.5 0.0465 (i)

21 The random variable X has a normal distribution with mean 4.5. It is given that P(X>5.5) 0.0465 (see diagram). 4.5 5.5 0.0465 (i) Find the standard deviation of X. (ii) Find the probability that a random observation of X lies between 3.8 and 4.8.

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