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March 27, 2017

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13. A set of final exam scores in an organic chemistry course was found to be normally distributed, with a mean of 73 and a standard deviation of 8. What is the probability of getting a score higher that 71 on this exam?

  • math - ,

    73-71 = 2
    2/8 = .24 sigma below mean
    go to normal distribution table
    .5948 of distribution is below .24 sigma above mean

  • math - ,

    55

  • math - ,

    Z =Variable - Mean/ Standard deviation
    Z =71-73/8
    Z =-2/8
    Z = -0.25
    Z value -.25 = .401294
    To find higher than 71
    1 - .401294 = 0.5987

    59.87 % will get a score higher than 71 on this exam.

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