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    josedelaluz's Avatar
    josedelaluz Posts: 7, Reputation: 1
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    #1

    Jun 14, 2009, 09:24 AM
    Statistics Confusion: Normal Approximation to Binomial
    I am having trouble with this problem:

    The Red Cross anticipates the need for 2000 units of type O blood. If 6% of the population is type O and the Red Cross anticipates 40,000 donations this year,

    a) what is the probability they will get at least 2000 units of type 0
    b)what is the probability they will get between 3000 and 4000 units?

    I calculated mu to be 2400 and sigma to be 47.5

    For part a) I get a z score of -8.4. Do I interpret this to mean that 0% lies to the left, therefore 100% probability that they will receive 2000 or more units?

    For part b) I get z scores of 33.7 and 12.6. These are so far out on the normal curve that 100% of the graph would lie to the left, meaning there is 0% chance of this happening.

    Are these answers possible? Am I missing something?
    Unknown008's Avatar
    Unknown008 Posts: 8,076, Reputation: 723
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    #2

    Jun 14, 2009, 10:13 AM

    Why did you now start another thread? You could have continues the thread you started before, where galactus already answered you.
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