4. Sam has 6 rose bushes. He counted the flowers on each of them. There are 8, 2, 5, 4, 11 and 9. Find the Standard Deviation. Is 13 a "Usual" number of flowers? (20 points)

5. The list gives the durations, in years, of the top 21 longest-running Canadian television shows. (10 points)

 18 20 38 19 22 23 23 27 36 18 18 18 20 25 18 24 24 33 25 25 

Construct a stem-and-leaf plot.

6. An emergency service wishes to determine whether a relationship exists between the outside temperature and the number of emergency calls it receives for a 7-hour period. The data are shown. (25 points)

Temperature x 25 10 27 30 33

No. of calls y 7 4 8 10 11

a) Find the correlation coefficient r

b) Find the regression equation

c) Graph the regression equation.