Q2 of 55 Page 631

A bag contains 5 red, 8 black and 7 white balls. Is chosen at random. What is the probability that the chosen ball is black?

Total number of balls bag containing is: 5 red + 8 black + 7 white = 20 balls


Number of red balls = 8


Probability P() =


Probability of getting a black ball P(black) =

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24

The table given below shows the ages of 75 teachers in a school.

















Age (in years)



18-29



30-39



40-49



50-59



No of teachers



5



25



35



10



Note Here 18-29 means from 18 to 29 including both. A teacher from the school is chosen at ramdom. What is the probability that the teacher chosen is


(i) 40 years or more then 40 years old?


(ii) 49 years or less then 49 years old?


(iii) 60 years or more then 60 years old?

 1

There are 600 electric bulbs in a box out of which 20 bulbs are defective. If one bulb is chosen at random from the box. What is the probability that the chosen bulb is defective?

 3

A bag contains 16 cards bearing number1,2,3…, 16 respectively. one card is chosen at random. What is the probability that the chosen card bears a number which is divisible by 3?

 4

In a cricket match a batsmen hits a boundary 4 times out of the 32 balls he plays. In a given ball. What is the probability that he does not hit the ball?