Probability Quiz Set 007 | Maths Aptitude Quiz Questions and Mock Test on Probability Set 7 | mock tests for Bank PO, SSC Exams, SO Clerical Exam, GATE Exam, LIC AO, GIC AO, etc.

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Question 1

If P(E) = 0.49, then what is the probability of non-occurrence of E?

0.51.

0.49.

0.5.

0.25.

Soln.
Ans: a

P(E) + P(non-occurrence of E) is always = 1. So P(non-occurrence of E) = 1 - P(E) = 0.51.

Solution | Discuss! | Chapters»

Question 2

A piggy bank contains 82 nos. of 50-paise coins, 37 nos. of 1-rupee coins and 80 nos. of 2-rupee coins. The piggy bank is turned upside down, and one coin falls down. What is the probability that it is a 50-paise coin?

${82/199}$.

$80/199$.

$83/199$.

$87/199$.

Soln.
Ans: a

Out of the total number of coins = 199, the chances favoring 50-paise coin are 82. So the probability is 82/199 = ${82/199}$.

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Question 3

From a deck of 52 cards 1 card is drawn at random. What is the probability that it will be a red Ace?

${1/26}$.

$9/12$.

$2/26$.

$6/26$.

Soln.
Ans: a

Number of ways of drawing 1 card = 52. There are two red Ace in the whole pack. So favorable chances are 2. Probability = 2/52 = 1/26.

Solution | Discuss! | Chapters»

Question 4

From a deck of 52 cards two cards are drawn at random. What is the probability that both one is a hearts, and the other a Spades?

${13/102}$.

$3/7$.

$14/102$.

$18/102$.

Soln.
Ans: a

Number of ways of drawing 2 cards out of 52 = ⁵²C₂ = $(52 × 51)/2$ = 1326. There are 13 hearts and 13 Spades in the deck. So 2 such cards can be drawn in 13 × 13 = 169 ways. The probability = 169/1326 = 13/102.

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Question 5

There are 40 students in Class X of a school of whom 25 are girls and 15 are boys. If one student is absent today, what is the probability that it is a girl?

5/8.

3/8.

1/2.

3/10.

Soln.
Ans: a

Outcomes favoring a girl are 25, so the probability is 25/40 = 5/8.

Solution | Discuss! | Chapters»