SOLUTION: amount being spent on personal phone calls followed a normal distribution with an average of $500/month and a standard eviation of $50/month. What is the probablity that a randomly

Question 948849: amount being spent on personal phone calls followed a normal distribution with an average of $500/month and a standard eviation of $50/month. What is the probablity that a randomly selected month had a call expense between $375 and $590?

I have come up with an answer of 0.9999 and 0.9579.
Answer by Fombitz(32388) (Show Source): You can put this solution on YOUR website!
How do you have two answers?
You should only have 1.
Find the z score for both points.

So then,

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