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Math Help - normalcdf question

  1. #1
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    normalcdf question

    One summer night at Bellair Lanes, a group of math professors went bowling. In true form, they decided to calculate their mean bowling score and standard deviation to use for the statistics problems. Here are the results: u(mean) 88, o(standard dev.)15.
    Find the probability that if a math professor is selected, his or her score will be greater than 100.
    100-88 / 15 = .8 normal cdf(.8,4) =.2118

    Find the probability that, if a math professor is selected, his or her score will be between 50 and 100.
    50-88 / 15 = -2.53 100-88 / 15 =.8 normal cdf(-2.53,.8)= .7824.
    Did I do the problems right? Thanks
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  2. #2
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    Quote Originally Posted by rowdy3 View Post
    One summer night at Bellair Lanes, a group of math professors went bowling. In true form, they decided to calculate their mean bowling score and standard deviation to use for the statistics problems. Here are the results: u(mean) 88, o(standard dev.)15.
    Find the probability that if a math professor is selected, his or her score will be greater than 100.
    100-88 / 15 = .8 normal cdf(.8,4) =.2118

    Find the probability that, if a math professor is selected, his or her score will be between 50 and 100.
    50-88 / 15 = -2.53 100-88 / 15 =.8 normal cdf(-2.53,.8)= .7824.
    Did I do the problems right? Thanks
    Your answers are correct.
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