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Probability

Multiple Choice Questions

71.

The following distribution gives the times taken by 25 students to solve a problem:

Time (in seconds)	Number of students
15-20	2
20-25	3
25-30	7
30-35	6
35–40	4
40-45	2
45-50	1

Find the probability that the time taken by a student to solve the problem lies in the interval 35–40 or 45–50.

$1 half space$
$1 third$
$1 fourth$
$1 fourth$

81 Views

72.

The following table presents the number of literate females in a town:

Age group	Number offemales
10-15	300
15-20	980
20-25	800
25-30	580
30-35	290
35-40	50

Find the probability that a literate female in from age group 10–15.

$1 fifth$
$1 over 10$
$1 half$
$1 half$

88 Views

73.

The distribution of weights (in kg) of 100 people is given below:

Weight (in kg)	Frequency
40-45	13
45-50	25
50–55	28
55-60	15
60-65	12
65-70	5
70-75	2

Find the probability that the weight of a people selected at random is in the class 45-50.

$1 half$
$1 third$
$1 fourth$
$1 fourth$

83 Views

74. The CBSE has prepared a list of 400 examiners in Mathematics. Out of these, 250 examiners are from government schools and 150 from private schools. Find the probability that an examiner selected at random from the list is from government school.

$5 over 8$
$3 over 8$
$1 fourth$
$1 fourth$

114 Views

75. There are 60 boys and 40 girls in a class. A student is selected at random. Find the probability that the student is a girl.

$1 fifth$
$2 over 5$
$space 3 over 5$
$space 3 over 5$

767 Views

76.
The blood groups of 30 students of Class VIII are recorded as follows:

A, B, O, O, AB, O, A, O, B, A, O, B, A, O, O,
A, AB, O, A, A, O, O, AB, B, A, O, B, A, B, O.

Find the probability that a student of Class VIII selected at random has his blood group AB.

$1 over 10$
$1 fifth$
$1 over 6$
$1 over 6$

1 over 10

114 Views

77. In a cricket match, a batsman hits a boundary 8 times out of 40 balls he plays. Then the probability that he did not hit boundary is

$8 over 40$
$4 over 5$

592 Views

78. If A and B are the only two outcomes of an event and P(A) = 0.32, then value of P(B) would be:

0.38
0.68
0.78
0.78

80 Views

79. In the throw of a die in a game of snakes and ladder the probability of getting an even number is:

$1 half$
$1 third$
1
1

105 Views

80. A coin is tossed 200 times. The head appears 79 times. The probability of a tail is:

$79 over 200$
$121 over 200$
1
1

152 Views

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Multiple Choice Questions

76. The blood groups of 30 students of Class VIII are recorded as follows: A, B, O, O, AB, O, A, O, B, A, O, B, A, O, O,A, AB, O, A, A, O, O, AB, B, A, O, B, A, B, O. Find the probability that a student of Class VIII selected at random has his blood group AB.