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

    Jun 12, 2009, 07:17 PM
    Statistics: Normal Approximation to Binomial
    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?
    galactus's Avatar
    galactus Posts: 2,271, Reputation: 282
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    #2

    Jun 13, 2009, 06:38 AM
    See this post for the same type of problem:

    https://www.askmehelpdesk.com/math-s...al-364152.html
    josedelaluz's Avatar
    josedelaluz Posts: 7, Reputation: 1
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    #3

    Jun 13, 2009, 04:05 PM
    Quote Originally Posted by galactus View Post
    See this post for the same type of problem:

    https://www.askmehelpdesk.com/math-s...al-364152.html
    Thanks, I tried the formula but ended up with a standard deviation of about 48, which when calculating z scores gave me numbers above three and less than negative 3. Does that mean that it is 100% chance for part a) z score of -8.89 means the area to the left is zero so the area to the right is 100%. For part b) I get z scores of 35 and 13. The area to the left of them would be 100%, so when subtracted would be 0% chance of this happening.

    Am I missing something or calculating something incorrectly
    mu = 2400 and sigma = 47.5
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