Question

1. A group of individuals were classified according to two factors: presence or absence of a disease and presence or absence of a set of symptoms.

	Disease
Symptoms	Yes	No
Yes	25	125
No	5	15

An individual is randomly selected from the group. Given that the disease is present, what is the probability that the symptoms are present?

Select one:

a. 0.83

b. 0.70

c. 0.88

d. 0.75

2.

A corporation receives a particular part in shipments of 100. Research has indicated the probabilities shown in the accompanying table for numbers of defective parts in a shipment.

Number of Defectives	0	1	2	3	4
Probability	0.29	0.36	0.22	0.10	0.03

How many of the defective parts would you expect to receive in a shipment of 100?

Select one:

a. 1.17

b. 1.00

c. 1.09

d. 1.22

Answer 1