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. $1/10$
• B. $11/100$
• C. $3/25$
• D. None of these

Answer 1

The correct option is D None of these

Sample Space is $\{-0.50,-0.49,...,0,0.01,...,0.49\}$.
$n\left(S\right)=100$
and the sound off error is at most $10$ paise if
$A=\{-0.10,-0.09,...,0.10\}$
$n\left(A\right)=20$
Therefore, Required probability is $\frac{20}{100}$.