(Solved): The raw data from question 1 have been summarized in the following grouped frequency distribution: ...

The raw data from question 1 have been summarized in the following grouped frequency distribution: a) Find the mean speed for the 30 motorists from the grouped frequency distribution. Explain or show how you arrived at your answer. Please report your answer to at least 2 decimal places. (Use the extra columns in the table if needed.) b) What is the modal class? c) What is the median class? d) Why is the mean you calculated in part a) of this question an estimate?