Question 1

What do you call the collection of all outcomes that is an element of one or the other of the sets A and B, or both of them?

Accepted Answer

Union

Answer

Condition

Answer

Intersection

Answer

Complement

Question 2

In the formula for finding the probability of a union of two events: P(A U B) = P(A) + P(B) – P(A ∩ B), why is P(A ∩ B) subtracted from P(A) + P(B)?

Accepted Answer

P(A ∩B) has been counted twice through P(A) and P(B).

Answer

This rule determines the probability of event A or B occurring, not A and B, so this factor is subtracted.

Answer

There is no explanation other than it’s just a part of the rule.

Answer

None of the above

Question 3

From a deck of 52 cards, what is the probability of drawing a number card or a spade?

Accepted Answer

10/13

Answer

40

Answer

49/52

Answer

49

Question 4

Mang Pepito has a farm with chickens and pigs. 27% are chickens and 39%are pigs. What is the probability that an animal chosen in random is either a chicken or a pig?

Accepted Answer

0.66

Answer

0.12

Answer

0.39

Answer

0.73

Question 5

Fifteen balls ina jar are numbered from 1 to 15. A ball is drawn at random. What is the probabilitythat the number on the ball is less than 6 or even?

Accepted Answer

2/3

Answer

2/15

Answer

7/15

Answer

5/15

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