74. Automobiles traveling on a road with a posted speed limit of 55 miles per hour are checked for speed by a state police radar system. Following is a frequency distribution of speeds.
74. Automobiles traveling on a road with a posted speed limit of 55 miles per hour are checked for speed by a state police radar system. Following is a frequency distribution of speeds.
Speed (miles per hour) 45-49 50-54 55-59 60-64 65-69 70-74 75-79
Frequency 10 40 150 175 75 15 10
Total 475
- What is the mean speed of the automobiles traveling on this road.
- Compute the variance and the standard deviation.
15.
Martinez Auto Supplies
has retail stores located in eight cities in California. The price they charge
for a particular product in each city are vary because of differing competitive
conditions. For instance, the price they charge for a case of a popular brand
of motor oil in each city follows. Also shown are the number of cases that
Martinez Auto sold last quarter in each city.
Excel File: data03-15.xls
Compute the average sales price per case for this product during the last quarter? Round your answer to two decimal places
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