A sum of money is rounded to the nearest rupee. The probability that the round- error is at most 10 paise is
(A) 63/300
(B) 11/100
(C) 3/25
(D) 21/100
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.
