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.
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