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Posted by on Wednesday, April 27, 2011 at 6:49pm.

the rate of return for an investment can be described by a normal distribution with mean 22% and standard deviation 3%. what is the probability that the rate of return for the investment will be at least 15%?

  • math - , Thursday, April 28, 2011 at 11:52am

    Z = (score-mean)/SD

    Find table in the back of your statistics text labeled something like "areas under normal distribution" to find the proportion related to that Z score.

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