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Question (11)

QN0037131

A box contains 7 green balls and 5 yellow balls. What is the probability of drawing a ball that is not yellow?

(A) 5/12
(B) 7/12
(C) 1/2
(D) 7/5

Correct Answer: B

Explanation:

Not yellow means green. P = 7/12.

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Question (12)

QN0037132

A card is drawn from a standard deck of 52 cards. What is the probability of getting a king?

(A) 1/52
(B) 1/26
(C) 1/13
(D) 4/13

Correct Answer: C

Explanation:

There are 4 kings among 52 cards. P = 4/52 = 1/13.

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Question (13)

QN0037133

A standard deck contains 52 cards. What is the probability of drawing a face card?

(A) 3/13
(B) 4/13
(C) 1/4
(D) 12/13

Correct Answer: A

Explanation:

There are 12 face cards: 4 kings, 4 queens and 4 jacks. P = 12/52 = 3/13.

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Question (14)

QN0037134

If the probability of an event is 0.37, then the probability of its complementary event is:

(A) 0.27
(B) 0.37
(C) 0.63
(D) 1.37

Correct Answer: C

Explanation:

P(not E) = 1 − 0.37 = 0.63.

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Question (15)

QN0037135

The sum of the probabilities of all elementary events of an experiment is:

(A) 0
(B) 1/2
(C) 1
(D) 2

Correct Answer: C

Explanation:

The probabilities of all elementary events together add up to 1.

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Question (16)

QN0037136

Two fair coins are tossed simultaneously. What is the probability of getting exactly one head?

(A) 1/4
(B) 1/2
(C) 3/4
(D) 1

Correct Answer: B

Explanation:

Outcomes are HH, HT, TH and TT. Exactly one head occurs in HT and TH, so P = 2/4 = 1/2.

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Question (17)

QN0037137

Two fair coins are tossed. What is the probability of getting two tails?

(A) 1/4
(B) 1/2
(C) 3/4
(D) 1

Correct Answer: A

Explanation:

Only TT gives two tails. Therefore P = 1/4.

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Question (18)

QN0037138

Two fair coins are tossed. What is the probability of getting at least one tail?

(A) 1/4
(B) 1/2
(C) 3/4
(D) 1

Correct Answer: C

Explanation:

Outcomes with at least one tail are HT, TH and TT. P = 3/4.

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Question (19)

QN0037139

Three fair coins are tossed together. What is the probability of getting three heads?

(A) 1/8
(B) 1/4
(C) 3/8
(D) 1/2

Correct Answer: A

Explanation:

There are 8 equally likely outcomes and only HHH gives three heads. P = 1/8.

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Question (20)

QN0037140

Three fair coins are tossed. What is the probability of getting exactly two heads?

(A) 1/8
(B) 3/8
(C) 1/2
(D) 5/8

Correct Answer: B

Explanation:

Favourable outcomes are HHT, HTH and THH. P = 3/8.

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Question (11)

A box contains 7 green balls and 5 yellow balls. What is the probability of drawing a ball that is not yellow?

Explanation:

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Question (12)

A card is drawn from a standard deck of 52 cards. What is the probability of getting a king?

Explanation:

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Question (13)

A standard deck contains 52 cards. What is the probability of drawing a face card?

Explanation:

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Question (14)

If the probability of an event is 0.37, then the probability of its complementary event is:

Explanation:

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Question (15)

The sum of the probabilities of all elementary events of an experiment is:

Explanation:

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Question (16)

Two fair coins are tossed simultaneously. What is the probability of getting exactly one head?

Explanation:

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Question (17)

Two fair coins are tossed. What is the probability of getting two tails?

Explanation:

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Question (18)

Two fair coins are tossed. What is the probability of getting at least one tail?

Explanation:

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Question (19)

Three fair coins are tossed together. What is the probability of getting three heads?

Explanation:

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Question (20)

Three fair coins are tossed. What is the probability of getting exactly two heads?

Explanation:

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