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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.

88 Views

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?

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)

P (A or B) = 0.60
$rightwards double arrow$ $straight P left parenthesis straight A union straight B right parenthesis space equals space 0.60$

P (A and B) = 0.12
$rightwards double arrow$ $straight P thin space left parenthesis straight A intersection straight B right parenthesis space equals space 0.12$
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$rightwards double arrow$ 0.60 = P(A) + P(B) - 0.12
$rightwards double arrow$ P(A) + P(B) = 0.72

$rightwards double arrow$ $left square bracket 1 minus straight P left parenthesis straight A with bar on top right parenthesis right square bracket plus left square bracket 1 minus straight P left parenthesis straight B with bar on top right parenthesis right square bracket space equals space 0.72$

$rightwards double arrow$ $straight P left parenthesis top enclose straight A right parenthesis space plus space straight P left parenthesis top enclose straight B right parenthesis space equals space 2 minus 0.72$

Hence, P(not A) + P (not B) = 1.28

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