In Exercise 6 1 7, lead concentrations near the San Diego Freeway in 1976 are given During the fall of 1977, the weekday afternoon lead concentrations (in g m3) at the measurement station near the San Diego Freeway in Los Angeles were as follows (a) Construct a frequency distribution and display th...

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In Exercise 6.1-7, lead concentrations near the San Diego Freeway in 1976 are given. During the fall

Question:

In Exercise 6.1-7, lead concentrations near the San Diego Freeway in 1976 are given. During the fall of 1977, the weekday afternoon lead concentrations (in Î¼g/m3) at the measurement station near the San Diego Freeway in Los Angeles were as follows:

(a) Construct a frequency distribution and display the results in the form of a histogram. Is this distribution symmetric?
(b) Calculate the sample mean and sample standard deviation.
(c) Locate , ± s on your histogram. How many observations lie within one standard deviation of the mean? How many lie within two standard deviations of the mean?
(d) Using the data from Exercise 6.1-7 and the data from this exercise, construct a back-to-back stem-and-leaf diagram with integer stems in the center and the leaves for 1976 going to the left and those for 1977 going to the right.
(e) Construct box-and-whisker displays of both sets of data on the same graph.

Distribution
The word "distribution" has several meanings in the financial world, most of them pertaining to the payment of assets from a fund, account, or individual security to an investor or beneficiary. Retirement account distributions are among the most...