Probability CBSE Questions & Answers

Probability

This is Mathematics Class 09 Probability CBSE Questions & Answers. There are 15 questions in this test with each question having around four answer choices.

Questions & Answers

1
The sum of the probabilities of All events of a trial is
  • A
    1
    Correct
  • B
    less than 1
  • C
    between 0 and 1
  • D
    greater than 1
2
The probability of a sure event is
  • A
    between 0 and 1
  • B
    less than 1
  • C
    more than 1
  • D
    1
    Correct
3
The probability of an event of a trial is always
  • A
    between 0 and 1 (both inclusive)
    Correct
  • B
    more than 1
  • C
    1
  • D
    0
4
The probability of an impossible event is
  • A
    more than 1
  • B
    1
  • C
    less than 1
  • D
    0
    Correct
5
In a cricket match, a batswoman hits the boundary 8 times out of 50 balls played by her. The probability that she did not hit a boundary is
  • A
    \({1 \over {50}}\)
  • B
    \({4 \over {25}}\)
  • C
    \({{21} \over {25}}\)
    Correct
  • D
    \({{41} \over {50}}\)
6
A die is thrown 300 times and odd numbers are obtained 153 times. Then, the probability of getting an even number is
  • A
    \({{147} \over {300}}\)
    Correct
  • B
    \({{147} \over {153}}\)
  • C
    \({{174} \over {300}}\)
  • D
    \({{153} \over {300}}\)
7
Gugu throws a die once. The probability that she shows a number less than 5 is :
  • A
    \({5 \over 6}\)
  • B
    \({1 \over 3}\)
  • C
    \({2 \over 3}\)
    Correct
  • D
    \({1 \over 6}\)
8
A tetrahedron is a four-sided object. Each side, or face, is an equilateral triangle. The numbers 1, 2, 3 and 4 are used to number the different faces. A trial consists of rolling the tetrahedron and reading the number that is face down. Then, P(4) is
Question 8 figure 1
  • A
    1
  • B
    \({1 \over 4}\)
    Correct
  • C
    4
  • D
    \({3 \over 4}\)
9
Weather forecast from a news channel was correct 125 times out of 365 days. The probability that on a given day it was not correct is
  • A
    \({{16} \over {73}}\)
  • B
    \({{5} \over {73}}\)
  • C
    \({{48} \over {73}}\)
    Correct
  • D
    \({{25} \over {73}}\)
10
Two coins are tossed simultaneously 300 times. Either one or two heads are obtained 198 times. The probability of getting no head is
  • A
    0.21
  • B
    0.36
  • C
    0.45
  • D
    0.34
    Correct
11
Two coins are tossed simultaneously. Then, the probability of getting at most one head is
  • A
    \({3 \over 4}\)
    Correct
  • B
    \({1 \over 4}\)
  • C
    \({2 \over 3}\)
  • D
    \({1 \over 3}\)
12
Which of the following cannot be the empirical probability of an event ?
  • A
    0
  • B
    \({3 \over 2}\)
    Correct
  • C
    \({2 \over 3}\)
  • D
    1
13
In n trials of a random experiment, if an event E happens m time, then P(E) is equal to
  • A
    \({m \over n}\)
    Correct
  • B
    \({n \over m}\)
  • C
    \({n \over {m + n}}\)
  • D
    \({m \over {m + n}}\)
14
A standard deck of 52 cards is shuffled. One card is drawn at random. The probability that the card is red or an ace is
  • A
    \({2 \over {13}}\)
  • B
    \({7 \over {13}}\)
    Correct
  • C
    \({7 \over {13}}\)
  • D
    \({5 \over {13}}\)
15
A fair die is tossed. Then, the probability of not rolling a number less than 5 is
  • A
    \({2 \over 5}\)
  • B
    \({1 \over 5}\)
  • C
    \({2 \over 3}\)
  • D
    \({1 \over 3}\)
    Correct