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Chapter 6: Q.14 (page 385)
What is the z-score of x= , if it is standard deviations to the left of the mean?
The score is
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The length of time it takes to find a parking space at 9 A.M. follows a normal distribution with a mean of five minutes and a standard deviation of two minutes.
Seventy percent of the time, it takes more than how many minutes to find a parking space?
a. 1.24
b. 2.41
c. 3.95
d. 6.05
Suppose X ~ N(12, 6). What is the z-score of x = 2?
Suppose . What value of is standard deviations to the left of the mean?
Table 6.4 shows a sample of the maximum capacity (maximum number of spectators) of sports stadiums. The table does not include horse-racing or motor-racing stadiums.
a. Calculate the sample mean and the sample standard deviation for the maximum capacity of sports stadiums (the data).
b. Construct a histogram.
c. Draw a smooth curve through the midpoints of the tops of the bars of the histogram.
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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