Posted by **Anonymous** on Tuesday, March 30, 2010 at 6:32pm.

A loaf of bread is normally distributed with a mean of 22 ounces and a standard deviation of .5 ounces.

What is the probability that a loaf of bread is < 20.75

- Stats -
**Ashley**, Tuesday, March 30, 2010 at 8:50pm
The first thing you have to do is find the z score. z=(20.75-22)/.5 The z would be -2.5 Then, to find the probability, you can use your graphing calculator. Hit 2nd, then catalog, then go down to normalpdf. When that comes up, plug in -2.5 and it should give you a probability of .0175.

Hope that helps!

- Stats -
**PsyDAG**, Wednesday, March 31, 2010 at 1:44pm
If you don't have a graphing calculator, you can find table in the back of your statistics text labeled something like "areas under normal distribution" to find the probability.

I hope that helps a little more.

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