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In Jan. 2011 the average rental rate for one bedroom apartments in Ann Arbor, Michigan was...

In Jan. 2011 the average rental rate for one bedroom apartments in Ann Arbor, Michigan was $796. Suppose rental rates for all one bedroom apartments in Ann Arbor follow approx. a normal distribution, with a standard deviation of $150. Find the approx. proportion of one-bedroom apartments for which the rental rate:

a) is less than $1000 a month.

b) is greater than $1000 a month.

c) is between $550 and $1000 a month.

Math   Statistics-And-Probability   
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