PROBABILITY MCQ 25 MATHS

Q1.Which of the following cannot be the probability of an event? 

(A) 0.4 (B) 4% (C) 0.04% (D) 4

Ans   D) 4

Q2.In a bag containing 24 balls, 

4 are blue, 11 are green and the rest are white. One ball is drawn at random. The probability that drawn ball is white in colour is (A) 1 / 6 B) 3 / 8 C ) 11 / 24 D) 5 / 8

Ans  B) 3 / 8

Q3.(A) Two dice are rolled together bearing numbers 

4, 6, 7, 9, 11, 12. Find the probability that the product of numbers obtained is an odd number 

Ans:

Total number of possible outcomes = 6x6=36 

For a product to be odd, 

both the numbers should be odd. Favourable outcomes are (7,7) (7,9) (7,11) (9,7) (9,9) (9, 11) (11,7) (11,9) (11,11) no. of favourable outcomes = 9 

P (product is odd) = 9/36 or 1 / 4

 

 Q 4. How many positive three digit integers have the hundredths digit 8 and unit’s digit 5? Find the probability of selecting one such number out of all three digit numbers.

Ans

Total number of three-digit numbers = 900.

First 100  last 999

 Numbers with hundredth digit 8 & and unit’s digit 5 are 805,815, 825,....,895 Number of favourable outcomes = 10

 P(selecting one such number) = 10/900 or 1/ 90