6 refer to exhibit i the mean is a 2 b 3 c 4 d none

6. Refer to Exhibit I. The mean is
a. 2
b. 3
c. 4
d. none of above
b.
a.
b.
b.
7. Refer to Exhibit I. The median is
8. Refer to Exhibit I. The range is
Exhibit II
Michael’s Compute-All, a national computer retailer, has kept a record of daily sales of laptop
computers over a period of 200 days. Their sales record is summarized below:
Number of Laptops Sold Number of Days
0-19 20
20-39 40
40-59 60
60-79 40
80-99 40
9. Refer to Exhibit II. The number of days on which the company sold 39 or fewer laptops is
10. Refer to Exhibit II. The proportion of days on which the company sold between 40 and 59
laptops is
a. 0.2
b. 0.3
c. 0.4
d. 0.6
2

±
± ² ³
11. The above figure is a Venn diagram showing three events ( A , B and C ) in the sample space
S . Event B is a subset of event A , while event C overlaps with both A and B . Which of
the following expressions correctly describes the event represented by the shaded area in the
Venn diagram? ( denotes complement.)
12. Continuing the last question, if we know that P ( A ) = 0 . 5, P ( B ) = P ( C ) = 0 . 15, P ( A ∩ C ) =
0 . 10 and P ( B ∩ C ) = 0 . 05, what is the probability of the shaded area in the Venn diagram?
13. Consider events A and B such that P ( A ) = 0 and P ( B ) = 0. Which of the following
statements is false ?
a. If A is any event, then 0 ≤ P ( A ) ≤ 1.