Question

A recent survey found that the ages of workers in a company is distributed as follows:

Age (in years)	21 - 40	41 - 60	Above 60
Number of workers	200	400	200

If a worker is selected at random, then the probability that the person is above 60 years is

• A. 0.20
• B. 0.25
• C. 0.40
• D. 0.5

Answer 1

The correct option is B 0.25

Total number of workers = 200 + 400 + 200 = 800
Number of workers above 60 years = 200

$\therefore \text{P(age is above 60 years)}=\frac{\text{Number of favourable outcomes}}{\text{Total number of outcomes}}$

$=\frac{200}{800}$

$=\frac{1}{4}$

= 0.25
Hence, the correct answer is option (b).