Question

There are 100 tickets in a lottery of Re. 1 each. There is only one ticket in the lottery bearing a prize of Rs. 80. A person purchases 1 ticket. His expectation is _______.

• A. 2
• B. 4
• C. -0.5
• D. -0.2

Answer 1

The correct option is D -0.2

$probabilityof1tickectfrom100ofRs80=\frac{1}{100}\times 80=0.8$
$exceptation=0.8-1=-0.2$