Question

A group of people were asked if they had run a red light in the last year. 315 responded "yes", and 190 responded "no".

Find the probability that if a person is chosen at random, they have run a red light in the last year.



Give your answer as a fraction or decimal accurate to at least 3 decimal places

Answer 1

0.624

Explanation:

Number who have run a red light = 315

Number who haven't run a red light = 190

From the data :

The total number of people sampled = total possible outcome = (315 + 190) = 505

Selecting a person at random, probability that the selected person has run a red light :

P = required outcome / Total possible outcomes

Required outcome = Number who have run a red light = 315

P(having run a red light) = 315 / 505 = 0.624