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# Revision Help: Normal Distribution watch

1. I don't get normal distribution. I think it's partly down to me not fully understanding the difference between discrete and continuous distributions and my inability to make use of the area under the curve.

Here's a typical question:
The times taken for customers to pass through a supermarket check out have been found to be normally distributed with a mean of 6 minutes and a standard deviation of 4 minutes. What is the probability that a customer (randomly picked) will require:

a) between 6-10 minutes
b) more than 10 minutes
c) less than 5 minutes
d) between 5-10 minutes

-------
I start off okay by writing down the formula and plugging in the variables but I can't get the last couple of steps after reading off the tables. I don't think I make use of the bell shape curve either.

Any help would be appreciated - exam coming up and all that.
2. which bit is the bit you don't understand?

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Updated: January 14, 2010
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