CBSE Board Practice

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CBSE Grade IX - Probability
Question 1
1.
Two coins are tossed simultaneously 40 times and it was observed that both tails appeared 30 times. If two coins are tossed simultaneously at random, what is the probability of getting both tails?
  • 3
    4
  • 1
  • 4
    5
  • 1
    2
  • 1
    4
Question 2
2.
A die is thrown 550 times. The number 1 appears on the upper face 64 times. Now the die is thrown at random. What is the probability of getting a 1 ?
  • 243
    275
  • 32
    275
  • 3
    25
  • 31
    275
  • 11
    92
Question 3
3.
Two players Bharathi and Simran play a tennis match. It is known that the probability of Bharathi winning the match is 0.75. What is the probability of Simran winning the match?
  • 0
  • 3
    4
  • 1
    2
  • 2
    5
  • 1
    4
Question 4
4.
Which of the following are true?
a)
    • P(E) + P(not E) = 1
b)
    • P(E) + P(
    •  

      E
       
       
    • ) = 0
c)
    • P(E) - P(
    •  

      E
       
       
    • ) = 0
d)
    • P(E) = 1 - P(
    •  

      E
       
       
    • )
e)
    • P(E) - P(not E) = 0
  • {c,d,a}
  • {b,a}
  • {a,d}
  • {e,b,a}
  • {c,d}
Question 5
5.
There are 78 students in a class room of whom 40 are boys and 38 are girls. From these students, one is choosen at random. What is the probability that the choosen student is a boy ?
  • 7
    13
  • 20
    39
  • 21
    40
  • 19
    39
Question 6
6.
Which of the following are possible values of probability?
a)
0.2
b)
1
8
c)
3
d)
5
2
e)
-3.4
  • {d,b,a}
  • {c,a}
  • {d,b}
  • {e,c,a}
  • {a,b}
Question 7
7.
In a lottery, there are 13 prizes and 13 blanks. What is the probability of not getting a prize?
  • 2
    3
  • 1
    2
  • 4
    5
  • 3
    4
  • 5
    6
Question 8
8.
Two coins are tossed simultaneously 70 times and it was observed that both heads appeared 60 times. If two coins are tossed simultaneously at random, what is the probability of getting both heads?
  • 6
    7
  • 5
    7
  • 1
  • 1
    7
  • 7
    8
Question 9
9.
Which of the following experiments have equally likely outcomes?
a)
A ball is hit. It reaches the boundary or not
b)
A man starts his vehicle. It starts or it does not starts
c)
A man throws a die. The number on the top is either 1 or not 1
d)
A baby is born. It is a boy or girl
e)
A true/false question is attempted. The answer is either right or wrong
  • {c,a,d}
  • {b,e,d}
  • {a,d}
  • {d,e}
  • {b,e}
Question 10
10.
A coin is tossed 90 times and head appears 70 times. If the coin is tossed again, what is the probability of getting a tail?
  • 2
    9
  • 1
    3
  • 3
    10
  • 7
    9
  • 1
    9