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Question: sales at a supermarket can be modelled using a normal...

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Sales at a supermarket can be modelled using a normal distribution with a mean of $300,000 and a standard deviation of $10,000. Find the probability that:

 

(a) Sales exceed $320,000

2.5%

(b) Sales are less than $290,000

17.5%

(c) Sales are between $305,000 and $307,000

P=

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