Question 1

When does the union of two events occur?

Accepted Answer

Either event A or event B occurs

Answer

Neither event A and event B occur

Answer

Event A and event B are mutually exclusive

Answer

Both event A and event B occur

Question 2

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 3

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

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

Answer

Either A or C

Answer

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

Question 4

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

Accepted Answer

$\frac{10}{13}$

Answer

$\frac{10}{13}$

Answer

49

Answer

40

Question 5

Two dice are tossed at the same time, what is the probability of getting a sum greater than 10?

Accepted Answer

$\frac{10}{13}$

Answer

$\frac{10}{13}$

Answer

3

Answer

$\frac{10}{13}$

Question 6

Fifteen balls in a jar are numbered from 1 to 15. A ball is drawn at random. What is the probability that the number on the ball is less than 6 or even.

Accepted Answer

$\frac{10}{13}$

Answer

$\frac{10}{13}$

Answer

$\frac{10}{13}$

Answer

$\frac{10}{13}$

Question 7

What is P(A∩B) if P(A) = 0.65, P(B) = 0.30 and P(A∪B) = 0.75?

Accepted Answer

0.20

Answer

0.30

Answer

0.15

Answer

0.65

Question 8

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

0.73

Answer

0.12

Answer

0.39

Question 9

In a class of 29 students, 15 like Science and 21 like Math. They all like at least 1 of the two subjects. What is the probability that a student chosen in random likes Math or Science?

Accepted Answer

1

Answer

$\frac{10}{13}$

Answer

$\frac{10}{13}$

Answer

$\frac{10}{13}$

Question 10

The result of a survey about student’s favorite tv network is shown below. What is the probability of getting a male student or student whose favorite is Network 2?

Accepted Answer

$\frac{10}{13}$

Answer

$\frac{10}{13}$

Answer

$\frac{10}{13}$

Answer

$\frac{10}{13}$

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