There are 21 students in a class,12 are boys and 9 are girls. The teacher chooses two at random.   If the first student chosen is a boy, explain why the probability that the second student chosen is also a boy is 11/20. Draw a tree diagram to illustrate the possible combinations of choosing two students. What is the probability that: i) both students are boys ii)both students are girls iii)one is a boy and one is a girl

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A: It is an important part of statistics. It is widely used.

Q: its number is found divisible by 3. What is the probability that its number is also divisible by 5?

A: Here use basic probability  and Bayes rule

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A:

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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.