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Frequency Distributions and Sampling

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Please help solve the following problems related to frequency distributions and sampling .

1. To get the best deal on a CD player, Tom called eight appliance stores and asked the cost of a specific model. The prices he was quoted are listed below:
$ 298 $ 125 $ 411 $ 157 $ 231 $ 213 $ 304 $ 272
Find the Standard deviation.

2. When investigating times required for drive-through service, the following results (in seconds) were obtained. Find the range, variance, and standard deviation for each of the two samples, then compare the two sets of results.

3. A company had 80 employees whose salaries are summarized in the frequency distribution below. Find the standard deviation. Find the standard deviation of the data summarized in the given frequency distribution.

4. The manager of a bank recorded the amount of time each customer spent waiting in line during peak business hours one Monday. The frequency distribution below summarizes the results. Find the standard deviation.

5. The heights of a group of professional basketball players are summarized in the frequency distribution below. Find the standard deviation.

Please refer to the attachment for complete questions.

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Solution Summary

The solution provides a step by step method for the calculation of descriptive statistics. Formula for the calculation and interpretations of the results are also included.

See Also This Related BrainMass Solution

Constructing a histogram: Frequency distribution example

Annual Salaries:

The frequency distribution illustrates the annual salaries, in thousands of dollars, of the people in management positions at the X-Chek Corporation.

Salary (in $1000) Number of People
35-40 3
41-46 6
47-52 9
53-58 8
59-64 7
65-70 6
71-76 4

a) Construct a histogram of the frequency distribution.
b) Construct a frequency polygon of the frequency distribution.

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