Question

Giving a test to a group of students, the grades and gender are summarized below

A B C Total
Male 20 10 13 43
Female 15 2 11 28
Total 35 12 24 71


If one student is chosen at random,

Find the probability that the student did NOT get an "B"

Answer 1

59 / 71

Explanation:

Given the data :

A B C Total

Male 20 10 13 43

Female 15 2 11 28

Total 35 12 24 71

The probability of randomly selecting a Student that got B ;

Probability = required outcome / Total possible outcomes

P(getting B) = number of students who got B / total number of students

P(getting B) = 12 / 71

Probability of getting B = 12 /71

Probability of not getting B = P(getting B)' = 1 - P(getting B)

Probability that student did not get "B" = 1 - 12/71 = 59 / 71