Question

The last page number of the textbooks of different subjects in a class is given.

$\begin{array}{cc}\text{Subject}& \text{Page Number}\\ \text{English}& 203\\ \text{Hindi}& 203\\ \text{Maths}& 152\\ \text{Physics}& 177\\ \text{Chemistry}& 225\\ \text{Biology}& 172\\ \text{Computer Sci.}& 185\\ \text{History}& 203\\ \text{Geography}& 172\\ \text{Moral Sci.}& 267\end{array}$

Find the probability that the last page number ends in
(i) an odd number.
(ii) an even number.
(iii) a multiple of 3.

• A. 0.1, 0.4 and 0.3
• B. 0.7, 0.3 and 0.3
• C. 0.2, 0.3 and 0.4
• D. 0.2, 0.4 and 0.3

Answer 1

The correct option is B 0.7, 0.3 and 0.3

Probability = $\frac{no.ofactualoutcomes}{totalno.ofoutcomes}$

Number of books = 10

Books with last page number ending in odd number = 7
Required probability =$\frac{7}{10}$ = 0.7

Books with last page number ending in even number = 3
Required probability =$\frac{3}{10}$ = 0.3

Books with last page number ending in a multiple of 3 = 3 (177, 225 and 267)
Required probability = $\frac{3}{10}$ = 0.3