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Mathematics : Probability

Short Answer Type

51.

In a survey of 500 families, number of vehicles owned per family were found to be as follows:

Number of vehicles named	Number of families
0	35
1	213
2	170
3	65
4	17

Find the probability that a family selected at random has

(i) no vehicles
(ii) 2 or 3 vehicles
(iii) more than 1 vehicle.

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52. In a cricket match, a batsman hits boundary in 20% of the balls he played. Find the probability that he did not hit a boundary.

234 Views

53. A bag contains 190 coins out of which, fifty र2 coins, forty र1 coins and rest र5 coins. One coin is selected at random. Find the probability that it has a र5 coin.

85 Views

54.

A die is thrown 1000 times with the following frequencies for the outcomes 1,2,3,4,5 and 6 as given below:

Outcome	Frequency
1	175
2	125
3	250
4	150
5	100
6	200

If the same die is thrown once more, find the probability of outcome 2, 4 and 6.

155 Views

55.

The ages of workers in a factory are given in the following table:

Age (in years)	Number of workers
21-23	3
23-25	4
25-27	5
27-29	6
29–31	5
31-33	4
33-35	3

Find the probability that the age of worker selected at random is at least 25 years.

95 Views

Multiple Choice Questions

56.

The minimum probablity of an event is

0
1
$1 half$
$1 half$

85 Views

57.

The maximum probablity of an event is

0
1
$1 half$
$1 half$

81 Views

58. What is the number of outcomes when a coin is tossed?

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59. What is the number of outcomes when a cubical dice is thrown?

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60. The sum of all the probabilities of all the possible outcomes of a trial is

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