# Random Variable and Previous Work Experience

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Business Statistics, ISOM2500 (L3, L4 & L5)
Practice Quiz I
1. The following bar chart describes the results of a survey concerning the relevance of study to present job by school.

Focus on the School of Business and Management. What are the mode and the median respectively?
(a) Relevant, Neutral
(b) Relevant, Relevant
(c) Neutral, Relevant
(d) Neutral, Neutral
2-4. The manager of a specialty outdoor store has gathered the following data concerning sales (in hundreds of dollars) of all the items sold by the store in the previous 2 months:
Item
(a) (1.87, 1.1)

(b) (1.87, 8.9)

(c) (8.13, 1.1)

(d) (8.13, 8.9)

11. Two events with positive probabilities are impossible to have the following relationship:
(a) Independent and mutually exclusive.
(b) Dependent and mutually exclusive.
(c) Independent and Not mutually exclusive.
(d) Dependent and Not mutually exclusive
12. If you roll two fair dice, what is the probability that the sum on the two dice equals 6?
(a) 3/36

(b) 4/36

(c) 5/36

(d) 6/36

13. Based on the following mosaic plot, which of the following statements is false?

(a) P (B) = 0.5
(b) P (B|A) = 0.25
(d) Events A and B are independent.

3

(c) P (B|Not A) = 0.75

14. The human resources manager at a company has classiﬁed applicants according to whether or not they have any computer skills (Yes or No), and whether or not they have previous work experience
(Yes or No). The results are summarized below:
Work Experience
Yes No
Yes 80
40 120
No 60
30 90
140 70 210

Computer skills

Which of the following statements is not correct?
(a) If an applicant is randomly selected and the applicant has previous work experience, then the probability that the applicant has computer skills is about 0.57
(b) If an applicant is randomly selected, the