JEE MATHEMATICS MCQ: PROBABILITY

1 Easy

1 of 1

Application +4 | -1

In a certain town,

40 \%

of the people have brown hair,

25 \%

have brown eyes and

15 \%

have both brown hair and brown eyes. If a person selected at random from the town, has brown hair, the probability that he also has brown eyes is

View answer and explanation

Correct option: B

\frac{3}{8}

Option B (3/8) is correct because it is the conditional probability of having brown eyes given that the person has brown hair, calculated using the formula P(B|A) = P(A ∩ B) / P(A).

More Questions from PROBABILITY

Practice All Chapter MCQs →

Consider the probability distribution

\begin{array}{cccccc}X: & 1 & 2 & 3 & 4 & 5 \\ P(X): & k^2 & 2 k & k & 2 k & 5 k^2\end{array}

The value of

P(X>2)

is A bag contains

\left( {2\;n + 1} \right)

coins. It is known that

n

of these coins have a head on both sides, whereas the remaining

n + 1

coins are fair. A coin is picked up at random from the bag and tossed. If the probability that the toss results in a head is 31/42, then

n

is equal to The probability that a bulb produced by a factory will fuse after 150 days of use is 0.05 . What is the probability that out of 5 such bulbs none will fuse after 150 days of use If

A

and

B

are two independent events such that

P\left( {A \cap B'} \right) = \frac{3}{{25}}

and

P\left( {A' \cap B} \right) = \frac{8}{{25}}

, then

P\left( A \right)

is equal to In a game two players

A

and

B

take turns in throwing a pair of fair dice starting with player

A

and total of scores on the two dice, in each throw is noted. A wins the game if he throws a total of 6 before

B

throws a total of 7 and

B

wins the game if he throws a total of 7 before A throws a total of six. The game stops as soon as either of the player wins. The probability of

A

winning the game is A box contains 5 brown and 4 white socks. A man takes out two socks. The probability that they are of the same colour is