# Basic Statistics c3 : My Essay Gram

Problems need to include all required steps and answer(s) for full credit. All answers need to be reduced to lowest terms where possible.

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1.    The final exam scores listed below are from one section of MATH 200.  How many scores were within one standard deviation of the mean? How many scores were within two standard deviations of the mean?

99   34   86   57   73   85    91   93   46    96   88   79    68   85   89

2.    The scores for math test #3 were normally distributed. If 15 students had a mean score of 74.8% and a standard deviation of 7.57, how many students scored above an 85%?

3.    If you know the standard deviation, how do you find the variance?

4.    To get the best deal on a stereo system, Louis called 8 out of 20 appliance stores in his neighborhood and asked for the cost of a specific model. The prices he was quoted are listed below:

\$216   \$135   \$281   \$189   \$218   \$193   \$299   \$235

Find the standard deviation.

5.    A company has 70 employees whose salaries are summarized in the frequency distribution below.

 Salary Number of Employees 5,001–10,000 8 10,001–15,000 12 15,001–20,000 20 20,001–25,000 17 25,001–30,000 13

a.    Find the standard deviation.

b.    Find the variance.

6.  Calculate the mean and variance of the sample data set provided below. Show and explain your steps. Round to the nearest tenth.

14,   16,   7,   9,   11,   13,   8,   10

7.    Create a frequency distribution table for the number of times a number was rolled on a die. (It may be helpful to print or write out all of the numbers so none are excluded.)

3,   5,   1,   6,   1,   2,   2,   6,   3,   4,   5,   1,   1,   3,   4,   2,   1,   6,   5,   3,   4,   2,   1,   3,   2,   4,   6,   5,   3,   1

8.    Answer the following questions using the frequency distribution table you created in No. 7.

a.    Which number(s) had the highest frequency?

b.    How many times did a number of 4 or greater get thrown?

c.    How many times was an odd number thrown?

d.    How many times did a number greater than or equal to 2 and less than or equal to 5 get thrown?

9.    The wait times (in seconds) for fast food service at two burger companies were recorded for quality assurance. Using the data below, find the following for each sample.

a.    Range

b.    Standard deviation

c.    Variance

Lastly, compare the two sets of results.

 Company Wait times in seconds Big Burger Company 105 67 78 120 175 115 120 59 The Cheesy Burger 133 124 200 79 101 147 118 125

10.What does it mean if a graph is normally distributed? What percent of values fall within 1, 2, and 3, standard deviations from the mean?

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