Birth weights at a Los Angeles hospital are normally distributed with a mean of 3350 grams and a standard deviation of 480 grams. If the babies weight is 4400 grams, would you consider this unusual? For what proportion of babies who weigh more than two standard deviations from the mean?
Added by Evan H.
Step 1
To find out if a birth weight of 4400 grams is unusual, we need to calculate the z-score, which measures how many standard deviations an observation is from the mean. The formula for the z-score is: \[ z = \frac{X - \mu}{\sigma} \] where \( X \) is the observed Show more…
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