According to the Empirical Rule, what percent of the observations lie within plus and minus one standard deviation of the mean? ________

121.  Five students were given a page of problems with the instructions to solve as many as they could in one hour.  Five students solved the following number of problems: 12, 10, 8, 6 and 4.  What is the arithmetic mean number of minutes required per problem?________

Answer: 7.5 minutes (average of 8 problems in an hour)       

122.  David Electronics had a profit of $10 million in 2002.  Profit doubled from 2002 to 2003 and profit increased eight fold from 2003 to 2004.  What was the annual geometric mean rate of growth from 2002 to 2004? ______________

Answer: 300% (4 fold)        

123.  What is the difference between the largest and the smallest values in a set of data? __________

Answer: range        

124.  When is the only time the variance equals the standard deviation? ________________

Answer:  

125.  According to the Empirical Rule, what percent of the observations lie within plus and minus one standard deviation of the mean? ________

Answer:

126.  What is the positive square root of the standard deviation? _________

Answer:  

127.  The capacities of several metal containers are: 38, 20, 37, 64, and 27 liters.  What is the range in liters? _____

Answer:

 

128.  What does the sum of the deviations of each value from the mean equal?  _____________________________________

Answer:  

129.  A company studied the commissions paid to furniture salespersons. If the variance is computed, what would be measured the unit of measure? ____________

Answer:

130.  A study measured the number of hours a light bulb will operate before it burns out.  If the variance of this distribution were computed, what would be the unit of measure? _____________________

Answer:  

Use the following to answer questions 131-141.

A sample of five full service gasoline stations, each carrying three grades of gasoline, was taken and the price per gallon (to the nearest cent) was recorded for each grade of gasoline, as shown in the table below.

 

131.  What is the mean price of Unleaded gas? ________

Answer:

132.  What is the mean price of Unleaded Plus gas? ________

Answer: 

133.  What is the mean price of Super Unleaded gas? ________

Answer:  

134.  What is the median price of Unleaded gas? ________

Answer:   

135.  What is the median price of Unleaded Plus gas? ________

Answer:

                                        

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