Question

10. 12 packets of salt, each marked 2 kg, actually contained the following
What is the probability that the chosen packet contains more than 2kg
11 In a cricket match, a batsman hits a boundary 6 times out of 30 balls
12. An organisation selected 2400 families at random and surveyed them
to determine a relationship between the income level and the number
of vehicles in a family. The information gathered is listed in the table
710
Secondary School Mathematics for Class 9
weights in kg) of salt
1.950, 2.120, 2.060, 1.980, 2.930, 1.970,
2.040, 1.990, 1.985, 2025, 2.000, 1.980.
Chat of these packets, one packet is chosen at random
of salt
he plays. Find the probability that he did not hit a boundary.
below
Number of vehicles per family
Monthly income
1
3 or more
25
305
27
0
2
Less than 25000
* 25000-30000
30000-35000
35000-40000
1
535
29
1
469
25
1
579
82
88
40000 or more
Suppose a family is chosen at random. Find the probability that the
family chosen is
(i) earning 25000 30000 per month and owning exactly 2 vehicles.
(ii) earning 40000 or more per month and owning exactly 1 vehicle.
(iii) earning less than 25000 per month and not owning any vehicle
(iv) earning 35000- 40000 per month and owning 2 or more vehicles.
(v) owning not more than 1 vehicle.
13. The table given below shows the marks obtained by 30 students in
a test.
1-10
Marks
(Class interval)
11-20
21-30
31-40
41-50
10
6
14
Number of students
(Frequency)
3
Out of these students, one is chosen at random. What is the probability
that the marks of the chosen student
(i) are 30 or less? (ii) are 31 or more? (iii) lie in the interval 21-307​

Answer 1

Answer:

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