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Question (41)

QN0037161

A box contains 120 shirts, of which 6 have major defects. What is the probability of selecting a shirt with a major defect?

(A) 1/10
(B) 1/20
(C) 1/15
(D) 1/24

Correct Answer: B

Explanation:

P(defective) = 6/120 = 1/20.

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Question (42)

QN0037162

In a box of 120 shirts, 6 have major defects. If a shirt is considered acceptable when it does not have a major defect, what is the probability of selecting an acceptable shirt?

(A) 0.90
(B) 0.94
(C) 0.95
(D) 0.96

Correct Answer: C

Explanation:

Acceptable shirts = 120 − 6 = 114. P = 114/120 = 0.95.

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Question (43)

QN0037163

A box contains 18 bulbs, of which 3 are defective. What is the probability of selecting a good bulb?

(A) 1/6
(B) 5/6
(C) 2/3
(D) 3/5

Correct Answer: B

Explanation:

Good bulbs = 18 − 3 = 15. P(good) = 15/18 = 5/6.

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Question (44)

QN0037164

A box contains 20 bulbs, of which 4 are defective. One good bulb is selected and removed. What is the probability that the next bulb selected is also good?

(A) 3/4
(B) 15/19
(C) 16/19
(D) 4/19

Correct Answer: B

Explanation:

Initially there are 16 good bulbs. After removing one good bulb, 15 good bulbs remain out of 19. P = 15/19.

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Question (45)

QN0037165

One disc is selected at random from discs numbered 1 to 60. What is the probability that the selected number is a multiple of 5?

(A) 1/5
(B) 1/6
(C) 1/10
(D) 1/12

Correct Answer: A

Explanation:

There are 12 multiples of 5 from 1 to 60. P = 12/60 = 1/5.

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Question (46)

QN0037166

One disc is selected at random from discs numbered 1 to 50. What is the probability that the selected number is a perfect square?

(A) 1/5
(B) 7/50
(C) 1/10
(D) 9/50

Correct Answer: B

Explanation:

Perfect squares are 1, 4, 9, 16, 25, 36 and 49. P = 7/50.

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Question (47)

QN0037167

A spinner has eight equally likely sections numbered 1 to 8. What is the probability of getting an odd number greater than 3?

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

Correct Answer: B

Explanation:

Favourable numbers are 5 and 7. P = 2/8 = 1/4.

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Question (48)

QN0037168

A die has six faces marked A, B, C, D, E and A. If the die is fair, what is the probability of getting A?

(A) = 2/6 = 1/3.
(B) 1/3
(C) 1/2
(D) 2/3

Correct Answer: B

Explanation:

Two of the six faces are marked A. P(A) = 2/6 = 1/3.

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Question (49)

QN0037169

A team has a probability of 0.68 of winning a match. Assuming the team either wins or loses, what is the probability that it loses?

(A) 0.22
(B) 0.32
(C) 0.38
(D) 0.68

Correct Answer: B

Explanation:

P(loss) = 1 − P(win) = 1 − 0.68 = 0.32.

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Question (50)

QN0037170

Three fair coins are tossed together. A player wins if all three coins show the same result. What is the probability of losing?

(A) 1/4
(B) 1/2
(C) 3/4
(D) 7/8

Correct Answer: C

Explanation:

All same outcomes are HHH and TTT, so P(win) = 2/8 = 1/4. Therefore P(lose) = 3/4.

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Question (41)

A box contains 120 shirts, of which 6 have major defects. What is the probability of selecting a shirt with a major defect?

Explanation:

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Question (42)

In a box of 120 shirts, 6 have major defects. If a shirt is considered acceptable when it does not have a major defect, what is the probability of selecting an acceptable shirt?

Explanation:

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Question (43)

A box contains 18 bulbs, of which 3 are defective. What is the probability of selecting a good bulb?

Explanation:

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Question (44)

A box contains 20 bulbs, of which 4 are defective. One good bulb is selected and removed. What is the probability that the next bulb selected is also good?

Explanation:

Link:

Question (45)

One disc is selected at random from discs numbered 1 to 60. What is the probability that the selected number is a multiple of 5?

Explanation:

Link:

Question (46)

One disc is selected at random from discs numbered 1 to 50. What is the probability that the selected number is a perfect square?

Explanation:

Link:

Question (47)

A spinner has eight equally likely sections numbered 1 to 8. What is the probability of getting an odd number greater than 3?

Explanation:

Link:

Question (48)

A die has six faces marked A, B, C, D, E and A. If the die is fair, what is the probability of getting A?

Explanation:

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Question (49)

A team has a probability of 0.68 of winning a match. Assuming the team either wins or loses, what is the probability that it loses?

Explanation:

Link:

Question (50)

Three fair coins are tossed together. A player wins if all three coins show the same result. What is the probability of losing?

Explanation:

Link:

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