question_answer

The following table shows the blood groups of 40 students of a class.

Blood group	A	B	O	AB
Number of students	13	7	14	6

One student of the class is chosen at random. What is the probability that the chosen student has blood group O?

A) 2.85       

B)                  0.35

C) 0.2                       

D) 2.35

E) None of these