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Probability

Multiple Choice Questions

111. A dice is thrown. What will be the probability of getting an even number?
$1 over 6$
$1 half$
$1 third$
$1 third$

1 half

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112. In a class of 40 students, 25 are girls. The probability of selecting a boy is:

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

97 Views

113.

In a blood test the following blood groups were recorded:

Blood group	No. of students
A	10
AB	15
B	11
O	3

A student is selected at random from the class. The probability that student has blood grou ‘AB’ is:

$5 over 13$
$7 over 13$
$8 over 13$
$8 over 13$

98 Views

114. In an experiment, E and F are the only two possible outcomes. If P(E) = 0.72, then P(F) is equal to:

0.38
0.28
0.72
0.72

209 Views

115.

In a medical examination of students of a class, the following blood groups are recorded:

Blood group	No. of students
A	10
AB	13
B	12
O	5

A student is selected at random from the class. The probability that a student has blood group ‘B’ is:

$1 fourth$
$13 over 40$
$3 over 10$
$3 over 10$

177 Views

116. Reena dialed a phone number 100 times in a week out of which she gets the response 55 times. The probability that she will not get the response is:

$55 over 100$
$100 over 55$
$45 over 100$
$45 over 100$

116 Views

117. A coin is tossed 10 times with the frequencies: Head—4, Tail—6. The probability of no head is:

$2 over 5$
$3 over 5$
0
0

91 Views

118.

The percentage of marks obtained by a student in mathematics in five monthly unit tests are given below:

Unit Test	I	II	III	IV	V
Percentage of marks obtained	69	71	73	68	74

Probability that the student gets more than 70% marks in the next unit test is:

0
$2 over 5$
$3 over 5$
$3 over 5$

94 Views

Short Answer Type

119.

Cards with numbers 1, 2, 3, …,100 are placed in a box and mixed thoroughly. One card is drawn, what is the probability that the card drawn is:

(i) a prime number less than 30
(ii) a multiple of 5 and 7
(iii) a multiple of 5 or 7

963 Views

120.

A die is thrown 400 times and outcomes are recorded as follows:

Outcome	Frequency
1	70
2	65
3	60
4	75
5	63
6	67

Find the probability of getting an add number.

170 Views