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?

Is known that a box of 800 electric bulbs contains 36 defective bulbs. One bulb is taken at random out of the box. What is the probability that the bulb chosen is nondefective?

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

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?

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?

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?