Q12 of 54 Page 320

A lot consists of 144 ball pens of which 20 are defective and the others are good. The shopkeeper draws one pen at random and gives it to Sudha. What is the probability that

She will not buy it?

Given,

⇒ Lot consists of total 144 ball pens.


⇒ Defective pens = 20


⇒ Sudha will not buy pens if pen is defective.


⇒ P(Sudha will not buy pen) =


⇒ P(Sudha will not buy pen) =


⇒ P(Sudha will not buy pen) =


∴ Probability Sudha will not buy a pen is


More from this chapter

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11

Suppose you drop a die at random on the rectangular region shown in figure. What is the probability that it will land inside the circle with diameter 1m?

 12

A lot consists of 144 ball pens of which 20 are defective and the others are good. The shopkeeper draws one pen at random and gives it to Sudha. What is the probability that

She will buy it?

 13

Two dice are rolled simultaneously and counts are added.

completes the table given below:


 13

Two dice are rolled simultaneously and counts are added.

A student argues that ‘there are 11 possible outcomes 2.3.4.5.6.7.8.9.10.11 and12. Therefore, each of them has a probability Do you agree with this argument? Justify your answer.