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  1. #1
    Prime Nip PharmD The Prime Nip's Avatar
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    Statistics Problems (Normal Distribution) (Reps)

    I know I have to use the equation "Z = x - mean/standard deviation" and then look up the AUC in a table for all of these questions, but all these problems are different. And if anyone knows of any good statistics websites, please link to it!

    The brain weights of a certain population of adult Swedish males follow approximately a normal distribution with mean 1,400 g and standard deviation 100g. What percentage of the brain weights are:

    a) 1325 and 1500g?
    b) 1325g or more?
    c) 1500g or less?
    d) between 1475 and 1600g?
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  2. #2
    Banned ddh69's Avatar
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    So basically what im getting from this post is that you are telling us that you are coming out of the closet?
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  3. #3
    Registered User sharpshooterz98's Avatar
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    Originally Posted by The Prime Nip View Post
    I know I have to use the equation "Z = x - mean/standard deviation" and then look up the AUC in a table for all of these questions, but all these problems are different. And if anyone knows of any good statistics websites, please link to it!

    The brain weights of a certain population of adult Swedish males follow approximately a normal distribution with mean 1,400 g and standard deviation 100g. What percentage of the brain weights are:

    a) 1325 and 1500g?
    b) 1325g or more?
    c) 1500g or less?
    d) between 1475 and 1600g?
    For example: (1400 - 1325) / 100 = .75 std deviations from the mean. Find the Z statistic/value for that ****. In this case .7734 (its a left tailed test)

    The (1400 - 1500) / 100 = 1 std deviations = 0.1587 (right tailed). Subtract that **** and you get....(.7734 - .1587) = .6147

    Just thing logically and use this website http://www.tutor-homework.com/statis...cs_tables.html

    Note: I am fairly buzze dand I accept no responsibility for the correctness of your answers
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