4. X is a Normal random variable with a mean of 5 and a standard deviation of 2. (a) What proportion of the population has X between 5.5 and 5.9? (b) What is the 30th percentile of X?

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4. X is a Normal random variable with a mean of 5 and a standard deviation
of 2.
(a) What proportion of the population has X between 5.5 and 5.9?
(b) What is the 30th percentile of X? 

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