Babies born after 40 weeks gestation have a mean length of 52.2 centimeters (about 20.6 inches). Babies born one month early have a mean length of 47.4 centimeters. Assume both standard deviations are 2.5 centimeters and the distributions are unimodal and symmetric. (Source: www. babycenter) a. Find the standardized score (z-score), relative to all U. S. births, for a baby with a birth length of 45 centimeters

  The standardized score (z-score), relative to all U.S. births, for a baby with a birth length of 45 centimeters is 2.88cm .                    

Step-by-step explanation:

It is given that the mean length of the babies born after the 40 weeks gestation period is 52.2cm

Standard deviation = 2.5

Baby born on one month earlier having mean length = 47.4cm

Now , we will use the formula for z-score ,

= -2.88

Therefore , A birth length of 45 centimeters is 2.88 below the mean standard deviation.

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