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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 -

    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 -

    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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