A lot consist of 144 balls, pens of which 20 are defective and others are good. The shopkeeper draws one pen at random and gives it to Sudha.
What is the probability,
1) She'll buy it?
2) She'll not buy it ?
:)
What is the probability,
1) She'll buy it?
2) She'll not buy it ?
:)
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Here is your answer :
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Given,
20 out of 144 are defective pens.
Number of good pens = 144 - 20 = 124
Total outcomes = 144
i) Sudha buys the good one,
Favourable outcomes = 124
p ( E ) = Favourable outcomes / No. of outcomes
= 124/144
= 31/36
ii) Sudha will not buy if it is defective pen.
Favourable outcomes = 20
P ( E ) = Favourable outcomes / total outcomes
= 20/144
= 5/36
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