Question

The probability of selecting a rotten apple randomly from a heap of 900 apples is 0.18. What is the number of rotten apples in the heap? [CBSE 2017]

Answer 1

Total number of apples = 900.
P(a rotten apple) = 0.18
$$\begin{gathered} \Rightarrow \frac{\mathrm{number}\mathrm{of}\mathrm{rotten}\mathrm{apples}}{\mathrm{total}\mathrm{number}\mathrm{of}\mathrm{apples}}=0.18 \\ \Rightarrow \frac{\mathrm{number}\mathrm{of}\mathrm{rotten}\mathrm{apples}}{900}=0.18 \\ \Rightarrow \mathrm{The}\mathrm{number}\mathrm{of}\mathrm{rotten}\mathrm{apples}=0.18\times 900=162\mathrm{apples}. \end{gathered}$$