Giving a test to a group of students, the grades and gender are
summarized below
A | B | C | Total | |
Male | 7 | 11 | 12 | 30 |
Female | 13 | 19 | 9 | 41 |
Total | 20 | 30 | 21 | 71 |
If one student was chosen at random,
find the probability that the student got a B.
Give your answer as a fraction or decimal
solution
given that
b grade student =30'total all student=71
probability=b grade student /total all student
=30/71
=0.4225
probability=0.4225
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