489 Section 9.2 9.11 Babies Weights (Example 20) Some sources report that the weights of full-term newborn babies have a mean of 7 pounds and a standard deviation of 0.6 pound and are Normally distributed. a. What is the probability that one newborn baby will have a weight within 0.6 pound of the mean-that is, between 6.4 and 7.6 pounds, or within one standard deviation of the mean? b. What is the probability the average of four babies' weights will be within 0.6 pound of the mean-that is, between 6.4 and 7.6 pounds? c. Explain the difference between a and b.

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9.11
n
9.2
489
Section 9.2
9.11
9.12
Chapter 9: Section Exercises
Babies Weights (Example 20) Some sources report that the weights of full-term
newborn babies have a mean of 7 pounds and a standard deviation of 0.6 pound and are
Normally distributed.
AP
a. What is the probability that one newborn baby will have a weight within 0.6
pound of the mean-that is, between 6.4 and 7.6 pounds, or within one standard
deviation of the mean?
b. What is the probability the average of four babies' weights will be within 0.6
pound of the mean-that is, between 6.4 and 7.6 pounds?
c. Explain the difference between a and b.
Babies' Weights, Again Some sources report that the weights of full-term newborn
babies have a mean of 7 pounds and a standard deviation of 0.6 pound and are Normally
distributed. In the given outputs, the shaded areas (reported as p =) represent the
probability that the mean will be larger than 7.6 or smaller than 6.4. One of the outputs
uses a sample size of 4, and one uses a sample size of 9.
489
Transcribed Image Text:n 9.2 489 Section 9.2 9.11 9.12 Chapter 9: Section Exercises Babies Weights (Example 20) Some sources report that the weights of full-term newborn babies have a mean of 7 pounds and a standard deviation of 0.6 pound and are Normally distributed. AP a. What is the probability that one newborn baby will have a weight within 0.6 pound of the mean-that is, between 6.4 and 7.6 pounds, or within one standard deviation of the mean? b. What is the probability the average of four babies' weights will be within 0.6 pound of the mean-that is, between 6.4 and 7.6 pounds? c. Explain the difference between a and b. Babies' Weights, Again Some sources report that the weights of full-term newborn babies have a mean of 7 pounds and a standard deviation of 0.6 pound and are Normally distributed. In the given outputs, the shaded areas (reported as p =) represent the probability that the mean will be larger than 7.6 or smaller than 6.4. One of the outputs uses a sample size of 4, and one uses a sample size of 9. 489
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