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# Probability

1.

The experiments which when repeated under identical conditions produce the same results or outcomes are known as

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2.

In a lottery, there are 10 prizes and 25 blanks. A lottery is drawn at random. What is the probability of getting a prize?

P (getting a prize) = 10/(10+25) = 10/35 = 2/7.

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3.

In a set of 30 game cards, 17 are white and rest are green. 4 white and 5 green are marked IMPORTANT. If a card is chosen randomly from this set, what is the possibility of choosing a green card or an ‘IMPORTANT’ card?

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4.

The probability of getting exactly one head in tossing a pair of coins is

Explaination: Reason: S = [HH, HT, TH, TT] = 4

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5.

Out of first 20 natural numbers, one number is selected at random. The probability that it is either an even number or a prime number is -.

n(S) = 20

n(Even no) = 10 = n(E)

n(Prime no) = 8 = n(P)

P(EᴜP) = 10/20 + 8/20 - 1/20 = 17/20

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6.

From a pack of 52 cards, two cards are drawn together at random. What is the probability of both the cards being kings?

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7.

A card is drawn from a pack of 52 cards. The probability of getting a queen of club or a king of heart is:

Here, n(S) = 52.

Let E = event of getting a queen of club or a king of heart.

Then, n(E) = 2.

P(E) = n(E)/n(S) = 2/52 = 1/26.

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8.

If three coins are tossed simultaneously, than the probability of getting at least two heads, is

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9.

The collection of one or more outcomes from an experiment is called

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10.

A box has 5 black and 3 green shirts. One shirt is picked randomly and put in another box. The second box has 3 black and 5 green shirts. Now a shirt is picked from second box. What is the probability of it being a black shirt?