A number is chosen from 1 to 20. Find the probability that the number chosen is :
(i) a prime number
(ii) a composite number
(iii) a square number
(iv) an odd number
(v) an even number
(vi) number between 7 and 14
A bag contains 9 red and 6 blue balls. Find the probability that a ball drawn from a bag at random is
(i) Red ball
(ii) blue ball
In a sample of 500 items, 120 are found to be defective. Find the probability that the item selected at random is
(i) Defective
(ii) non-defective
In a school of 1800 students, there are 875 girls. Find the probability that a student chosen at random is
(i) a boy
(ii) a girl
In a cricket match, a batsman hit a boundary 12 times out 45 balls he plays. Find the probability that he did not hit a
boundary.
A coin is tossed 700 times and we get head : 385 times; tail : 315 times. When a coin is tossed at random, what is
the probability of getting:
(i) a head?
(ii) a tail?
Two coins are tossed 600 times and we get two heads: 138 times, one head : 192 times ; no head : 270 times. When
two coins are tossed at random, what is the probability of getting?
(i) 2 heads?
(ii) 1 head?
(iii) no head?
Three coins are tossed 250 times and we get: 3 heads : 46 times; 2 heads : 56 times; 1 head : 70 times; 0 head : 78
times. When three coins are tossed at random, what is the probability of getting :
(i) 3 heads ?
(ii) 2 heads?
(iii) at least 2 heads?
(iv) atmost 2 heads?
A die is thrown 300 times and the outcomes are noted as given below :Frequencies 58 75 52 39 42 34 Outcomes 1 2 3 4 5 6 When a die is thrown at random, what is the probability of getting a:
(i) 4
(ii ) 6
(iii) number less than 3
(iv) number which is prime
In a survey of 350 ladies, it was found that 235 like coffee, while rest of them dislike it. Find the probability
that a lady chosen at random:
(i) likes coffee
(ii) dislikes coffee.
On one page of a telephone directory, there are 200 phone numbers. The frequency distribution of their units digit is given below : Frequency 21 20 21 21 22 25 22 17 15 16 Units digit 0 1 2 3 4 5 6 7 8 9 One of the numbers is chosen at random from the page. What is the probability that the units digit of the chosen number is
(I) 5
(ii) 8
(iii) an even number
(iv) an odd number
