Question

A sum of money is rounded off to the nearest rupee. The probability that the round-off error is at most 10 paise is

(A) 63/300 

(B) 11/100 

(C) 3/25 

(D) 21/100

Answer 1

Answer is (D) 21/100

Sample space is { –0.50, –0.49, ..., –0.01, 0, 0.01, ...., 0.49} and the event is {–0.10, –0.09, ..., 0.10}.

Hence, the probability is 21/100.