A sum of money is rounded off to the nearest rupee. The probability that round off error is at least ten paise is
Answer & explanation
Correct answer: option 1
Let the sum of money be x ₹ and y paise. Then , y can take the following values.
01, 02, ............., 99
Therefore, round off error inpaise can be
00, ± 01, ± 02, ......, ±49, 50
The round off error will be at least ten paise if it is
±10, ± 11, ± 12, ......, ±49, 50
Hence, required probability $=\frac{81}{100}$