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15. Probability
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Q5 of 55 Page 623

The table given below shows the month of birth of 36 students of a class:

































Month of birth



Jan.



Feb.



March



April



May



June



July



Aug.



Sep.



Oct.



Nov.



Dec.



No. of students



4



3



5



0



1



6



1



3



4



3



4



2



A students is chosen at random from the class. What is the probability that the chosen student was born in October?

Total number of students: 36


Number of students born in October: 3


Probability P() =


Let p(Oct.) be probability of students born in October.


P (Oct.) =


P (Oct.) = =

More from this chapter

All 55 →
3

A survey of 200 persons of a locality shows the liking and disliking of tea.











No of persons who like tea



148



No of persons who dislike tea



52



Out of these one was chosen at random. What is the probability that the chosen person likes tea?

4

In a locality, 1000 families were chosen at random and the following data was collected:



















Number of children in each family



0



1



2



3



4 or more



Number of families



6



184



672



127



11



Out of these families, a family was chosen at random. What is the probability that the chosen family has 2 children?

6

In 50 tosses of a coin, tail appears 32 times. If a coin is tossed at random, what is the probability of getting a head?

7

In a cricket match, a batsman hits a boundary 6 times out of 30 balls he plays. What is the probability that in a given throw, the ball does not hit the boundary?

Questions · 55
15. Probability
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