A newborn who weighs 2,500 g or less has a low birth weight. Use the information on the right to find the z-score of a 2,500 g baby.
Answers
Given : A newborn who weighs 2,500 g or less has a low birth weight.
To find : z-score of a 2,500 g baby
Solution:
Missing Data :
birth weights of newborn babies are approximately normally distributed with a mean of mu = 3,600 grams and a standard deviation of sigma = 500 grams
Mean = 3600
SD = 500
Z score = ( Value - Mean)/SD
=> Z Score = ( 2500 - 3600)/500
=> Z score = -1100/500
=> Z score = -2.2
z-score of a 2,500 g baby = -2.2
=> 1.39 % Newborn baby have low birth weight
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