Complementary Event

Q. If P(E) = 0.05, then the probability of ‘not E’ is .

1. 0.5
2. 1
3. 0.95
4. 0.005

Q. Question 18
If a card is selected from a deck of 52 cards, then the probability of its being a red face card is
(a) $\frac{3}{26}$
(b) $\frac{3}{13}$
(c) $\frac{2}{13}$
(d) $\frac{1}{2}$

Q.

Three coins are tossed at once. What is the probability of getting at least two tails?

Q.

A box contains 3 blue, 2 white and 4 red marbles. If a marble is drawn at random from the box, what is the probability that it will not be a white marble?
(a) $\frac{1}{3}$ (b) $\frac{4}{9}$ (c) $\frac{7}{9}$ (d) $\frac{2}{9}$

Q. The probability of a day being rainy is 0.75, then the probability of it not being a rainy day is .

1. $0.79$
2. $0.25$
3. $0.50$
4. $0.36$

Q.

IF the probability of winning a game is 0.4 then te probability of losing it, is
(a) 0.96 (b) $\frac{1}{0.4}$ (c) 0.6 (d) none of these

Q.

What is the probability of getting a black ace or a red jack when drawing a card from a deck of 52?

Q.

The sum of probabilities of two mutually exclusive events will always be 1.

1. True

2. False

Q.

Three cards are drawn at random from a pack of $52$ cards.

What is the chance of drawing three aces?

1. $\frac{3}{5525}$

2. $\frac{2}{5525}$

3. $\frac{1}{5525}$

4. None of these.

Q.

Complementary events are mutually exclusive, and vice versa.

1. True

2. False

Q.

A dice is thrown once. Find the probability of getting a factor of 6.

1. 1/3

2. 1

3. 2/3

4. 2/5

Q. A card is drawn from a deck of 52 cards. What is the probability of not getting an ace?

1. $\frac{1}{12}$
2. $\frac{12}{13}$
3. $\frac{2}{13}$
4. $\frac{1}{13}$

Q.

The probability of a person winning a game is 0.8, the probability of him losing a game is__.

Q. Find the probability of having 53 Saturdays in:
i) a non - leap year
ii) a leap year
[4 MARKS]

Q.

Assume that boy and girl babies are equally likely. If a couple have three children, find the probability that at least one is a boy.

1. 0.875

2. 0.785

3. 0.578

4. 0.75

Q. Three different coins are tossed together. Find the probability of getting (i) exactly two heads, (ii) at least two heads (iii) at least two tails.

Q.

1. 3.64, –0.14

2. 3.62, –0.11

3. 3.63, –0.17

4. 3.61, –0.10

5. 3.65, –0.15

Q.

Find the probability that a number selected at random from the numbers 1 to 25 is not a prime number.

1. 

2. 

3. 

4. 

Q.

Fill in the blanks:
(i) The probability of an impossible event is
(ii) The probability of a sure even is
(iii) For any event E, P(E) + P (not E)= ....
(iv) The probability of a possible but not a sure event lies between... and ....
(v) The sum of probabilities of all the outcomes fo an experiment is ....

Q.

A jar contains $5$ red marbles, $3$ green marbles, $2$ yellow marbles and $1$ blue marble. How do you find the probability of green or yellow marble?

Q. Question 15
If the probability of an event is P, then the probability of its completmentry event will be
(a) P - 1
(b) P
(c) 1 - P
(d) $1-\frac{1}{P}$

Q.

The probability that it will rain tommorow is 0.85. What is the probability that it will not rain tommorow ?

Q.

A jar contains $24$ marbles, some are green and others are blue. If a marble is drawn at random from the jar, the probability that it is green is $\frac{2}{3}$. Find the number of blue balls in the jar.

Q. What is the probability of an event E not happening if P(E) = 0.2?

1. 0.2
2. 0.8
3. 0.3
4. 0.6

Q. If P(E) denotes the probability of an event E then [CBSE 2013C]

(a) P(E) < 0
(b) P(E) > 1
(c) 0 ≤ P(E) ≤ 1
(d) −1 ≤ P(E) ≤ 1

Q.

The probability of winning a game is $\frac{2}{5}$, the probability of losing is__.

( In decimal form)

Q.

IF the probability fo occurrence of an event is p then the probability of non-happening of this event is
(a) (p-1) (b) (1-p) (c) p (d) $(1-\frac{1}{p})$

Q. A jar contains 30 marbles, some are green and others are red. If a marble is drawn at random from the jar, the probability that it is green is $\frac{3}{5}$. Find the number of green balls in the jar. $\left[2\right]$

Q.

The cards bearing letters of the word MATHEMATICS are placed in a bag. A card is taken out from the bag without looking into the bag (at random).

What is the probability of getting (i) M ?

Q. Ram and Shyam are playing a match. If the probability of Ram winning the match is 0.6, then find the probability of Shyam winning the match.

1. 0.2
2. 1
3. 0.4
4. 0.8