Mathematics, 21.02.2020 19:54 karmaxnagisa20
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 475a. What is the mean speed of the automobiles traveling on this road? b. Compute the variance and the standard deviation.
Answers: 3
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Automobiles traveling on a road with a posted speed limit of 55 miles per hour are checked for speed...
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