Find the mean of the data summarized in the given frequency distribution. 12) The highway speeds of 100 cars are summarized in the frequency distribution below. Find the mean speed. Speed (mph) Cars...

Find the mean of the data summarized in the given frequency distribution.

12)The highway speeds of 100 cars are summarized in the frequency distribution below.  Find the mean speed.

A) 61.3 mph

B) 58.5 mph

C) 55.7 mph

D) 54.5 mph

I said, D, and it is wrong.