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Probability

Short Answer Type

541. A card is drawn from a well shuffled pack of 52 cards. Find the probability that it is a king or an ace.

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542. A card is drawn from a well shuffled pack of 52 cards. Find the probability that it is a spade or a club.

96 Views

543. A card is drawn from a well shuffled pack of 52 cards. Find the probability that it is a king or a red card.

120 Views

544. A card is drawn from a well shuffled pack of 52 cards. Find the probability that it is neither a heart nor a king.

98 Views

Long Answer Type

545. A bag contains 8 balls, identical except in colour, of which 5 are red and 3 are white. A man draws two balls at random. What is the probability that:

(a) one of the balls is red and one is white?

(b) both the balls are of same colour?

112 Views

546. In a town of 6000 people, 1200 are over 50 years in age and 2000 are females. It is known that 30% of the females are over 50 years in age. What is the probability that randomly chosen individual from the town is either female or over 50 years in age?

121 Views

Short Answer Type

547. The probability that a person visiting a dentist will have his teeth cleaned is 0.44, the probability that he will have a cavity filled is 0.24. The probability that he will have his teeth cleaned or a cavity filled is 0.60. What is the probability that a person visiting his dentist will have his teeth cleaned and cavity filled?

Event A: the person will have teeth cleaned.
$rightwards double arrow$ P(A) = 0.44
Event B: the person will have cavity filled.
$rightwards double arrow$ P(B) = 0.24
P(the person will have teeth cleaned or cavity filled) = $straight P space left parenthesis straight A union straight B right parenthesis space equals space 0.60$
We have to find the probability of the person to have his teeth cleaned and cavity filled i.e.,
$straight P left parenthesis straight A intersection straight B right parenthesis$
Now, $straight P space left parenthesis straight A union straight B right parenthesis space equals space straight P left parenthesis straight A right parenthesis plus straight P left parenthesis straight B right parenthesis minus straight P left parenthesis straight A intersection straight B right parenthesis$
$rightwards double arrow$ 0.60 = 0.44 + 0.24 $space space minus straight P left parenthesis straight A intersection straight B right parenthesis$
Hence, $space space straight P thin space left parenthesis straight A intersection straight B right parenthesis space equals space 0.44 plus 0.24 minus 0.60 equals 0.08$

153 Views

548. A and B are two events of a mathematical experiment such that P(A or B) = 0.60 and P (A and B) = 0.12. Find P(not A) + P(not B)

100 Views

Long Answer Type

549.

If A and B are two events such that $straight P left parenthesis straight A right parenthesis equals 1 over 6 comma space straight P left parenthesis straight B right parenthesis equals 1 third space and space straight P space left parenthesis straight A space and space straight B right parenthesis space equals space 1 over 12 comma$ find
(a) P (A or B) (b) P (not A and not B)
(c) P (A and not B) (d) P (B and not A)

101 Views

Short Answer Type

550.

If $straight P left parenthesis straight A union straight B right parenthesis space equals space 0.85 comma space straight P left parenthesis straight A intersection straight B right parenthesis space equals space 0.35 comma space straight P left parenthesis straight A right parenthesis space equals space 0.7 comma space find space straight P left parenthesis straight B right parenthesis.$

149 Views