Grades earned in a class are recorded for 2 group of students (students taking only History and the others only taking Biology), the grades in those classes are summarized below. A B C Total History 11 7 18 36 Biology 2 4 12 18 Total 13 11 30 54 If one student was chosen at random, find the probability that the student got a B. Give your answer as a fraction or decimal.
Contingency Table
A contingency table can be defined as the visual representation of the relationship between two or more categorical variables that can be evaluated and registered. It is a categorical version of the scatterplot, which is used to investigate the linear relationship between two variables. A contingency table is indeed a type of frequency distribution table that displays two variables at the same time.
Binomial Distribution
Binomial is an algebraic expression of the sum or the difference of two terms. Before knowing about binomial distribution, we must know about the binomial theorem.
Grades earned in a class are recorded for 2 group of students (students taking only History and the others only taking Biology), the grades in those classes are summarized below.
| A | B | C | Total | |
| History | 11 | 7 | 18 | 36 |
| Biology | 2 | 4 | 12 | 18 |
| Total | 13 | 11 | 30 | 54 |
If one student was chosen at random,
find the probability that the student got a B.
Give your answer as a fraction or decimal.
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