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Example Suppose, on average, the post office deals with 10,000 messages per day with a difference...

Example Suppose, on average, the post office deals with 10,000 messages per day with a difference of 2000. What can be said about the possibility that this post office will handle between 8,000 and 12,000 messages tomorrow?
Math   Statistics-And-Probability   
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Answer #1

Mean==10000

Standard deviation= =2000

8000<x<12000

10000-2000<x<10000+2000

<x<

According to the 68-95-99.7 rule,the mean in a normal distribution of values that lie within a band around the mean in a normal distribution with a width of two ,four or six standard deviation respectively .

So,the possiblity that this post office will handle between 8000 and 12000 messages tomorrow is 68%.

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