A random sample of bonuses (in millions of dollars) paid by large companies to their executives is shown. These data will be used for Exercise 18 in Section 3–2.

Class boundaries         Frequency

0.5–3.5………………….11

3.5–6.5………………….12

6.5–9.5…………………..4

9.5–12.5…………………2

12.5–15.5………………..1

Find the :

a. Mean

b. Modal class