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Normal Distribution

It is said that sufferers of a cold virus experience symptoms for 7 days. However, the amount of time is actually a normally distributed random variable whose mean is 7.5 days and whose standard deviation is 1.2 days.

a. What proportion of cold sufferers experiences less than 4 days of symptoms?

b. What proportion of cold sufferers experiences symptoms for between 7 and 10 days?

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a. What proportion of cold sufferers experiences less than 4 days of symptoms?

Z = (4 - 7.5) / ...

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