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Statistics / Elementary Statistics 12 / Chapter 10.6 / Problem 6 CRE

Elementary Statistics | 12th Edition | ISBN: 9780321836960 | Authors: Mario F. Triola

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Birth Weights Birth weights in the United States are

Chapter 10, Problem 6 CRE

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QUESTION:

Problem 6 CRE

Birth Weights Birth weights in the United States are normally distributed with a mean of 3420 g and a standard deviation of 495 g.

a. What percentage of babies are born with a weight greater than 3500 g?

b. Find P10, which is the 10th percentile.

c. The Rockland Medical Center requires special treatment for babies that are less than 2450 g (unusually underweight) or more than 4390 g (unusually overweight). What is the percentage of babies who require special treatment? Under these conditions, do many babies require special treatment?

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QUESTION:

Problem 6 CRE

Birth Weights Birth weights in the United States are normally distributed with a mean of 3420 g and a standard deviation of 495 g.

a. What percentage of babies are born with a weight greater than 3500 g?

b. Find P10, which is the 10th percentile.

c. The Rockland Medical Center requires special treatment for babies that are less than 2450 g (unusually underweight) or more than 4390 g (unusually overweight). What is the percentage of babies who require special treatment? Under these conditions, do many babies require special treatment?

ANSWER:

Answer

Step 1 of 6

Given mean=3420, SD=495

a)Z= $\frac{x-mean}{SD}$

= $\frac{3500-3420}{495}$

=0.167

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