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? asked in Science & MathematicsMathematics · 2 years ago

help with this statistic question!?

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2 Answers

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  • Alan
    Lv 7
    2 years ago

    95 % around the mean 

    goes from 2.5 % to 97.5 

    P(z<Z) = 0.975  is Z = 1.96 

    and by symmetry  Z = -1.96  is the bottom end 

    so go back the the formula 

    Z = (x- mean)/ standard deviation 

    x-mean = Z*standard deviation 

    x = mean + Z*standard deviation  

    so the range is from 

    x_low = 135  - 1.96*11 = 113.44

    x_high = 135 + 1.96*11 = 156.56 

    so any number between these two values 

    so 150 

    123 

    and 132 are all within these range. 

    (159 and 106 are not) 

  • Anonymous
    2 years ago

    Hmmmmmmmmm!!!! I really do not know at this point

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