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Chapter 6: Q. 20 (page 385)
Suppose . What value of is two standard deviations to the right of the mean?
The value ofis two standard deviations to the right of the mean is
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About what percent of values lie between the first and second standard deviations from the mean (both sides)?
Use the following information to answer the next four exercises:
Find the probability that
About what percent of the x values from a normal distribution lie within two standard deviations (left and right) of the mean of that distribution?
About what percent of x values from a normal distribution lie within one standard deviation (left and right) of the mean of that distribution?
Height and weight are two measurements used to track a child鈥檚 development. The World Health Organization measures child development by comparing the weights of children who are the same height and the same gender. In 2009, weights for all cm girls in the reference population had a mean kg and standard deviation . Weights are normally distributed. . Calculate the z-scores that correspond to the following weights and interpret them.
a. 11 kg
b. 7.9 kg
c. 12.2 kg
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