Question

In a sample survey of 645 people, it was found that 516 people have a high school certificate. If a person is chosen at random, what is the probability that he/she has a high school certificate?

(a) $\frac{1}{2}$

(b) $\frac{3}{5}$

(c) $\frac{7}{10}$

(d) $\frac{4}{5}$

Answer 1

ANSWER:
Total number of people surveyed = 645
Number of people who have a high school certificate = 516
∴ P(Person has a high school certificate)
= $\frac{\text{Number of people who have a high school certificate}}{\text{Total number of people surveyed}}=\frac{516}{645}=\frac{4}{5}$
Hence, the correct answer is option (d).