26/take Find the mean of the data summarized in the given frequency distribution. The highway speeds of 100 cars are summarized in the frequency distribution below. Find the mean speed. Speed (mph) Cars 30-39 5 40-49 18 50-59 50 60-69 17 70-79 10 54.5 mph 60.9 mph 58.2 mph 55.4 mph Question 9 9 pts Find the standard deviation for the given sample data. Round your answer to one more decimal place than is present in the original data. 22.6 16.1 36.1 36.0 23.8 20.3 3999.0 36.1 8.35 4347.7