show all of the steps. Start questions involvingformulas by writing down the formula and thensubstituting for the variables in the formula.

1. Find the mean of each of the following sets of numbers. a. 5, 6, 6, 8, 9, 11, 13, 14, 17 b. 148, 153, 156, 15?,160 c. 44.5, 47.5, 48.5, 51.5, 52.5, 54.5, 55.5, 56.5 2. Find the mean of each of the following frequency distributions. W? W [W W [WT I 1 | 30 to under 35 3. The table shows the speeds of 200 vehicles passing a particular point: Find the average speed. 4. On a certain day the number of books on 40 shelves in a library were noted and grouped as shown. Find the mean number of books on the shelf. [W 4 [W 5 | 45 to under 45 15 [W 13 | 55 to under 55 5 I 55 to under 60 5. If the mean of the following numbers is 17, find the c value. Produce an algebraic solution. Guess and check is unacceptable. 12, 18, 21, c, 13 8. The mean of 10 numbers is 8. If an 11th number is now included in the results, the mean becomes 9. What is the value of the 11th number? Produce an algebraic solution. Guess and check is unacceptable. 7. The mean of 4 numbers is 5 and the mean of 3 different numbers is 12. What is the mean of the 7' numbers together? Produce an algebraic solution. Guess and check is unacceptable