Q2/ A doctor is studying the relationship between blood pressure and heartbeat abnormalities in her patients. She tests a random sample of her patients and notes their blood pressures (high, low, or normal) and their heartbeats (regular or irregular). She finds that: (i) 16% have high blood pressure. (ii) 20% have low blood pressure. (iii) 12% have an irregular heartbeat. (iv) Of those with an irregular heartbeat, one-fourth have high blood pressure. (v) Of those with normal blood pressure, one-seventh have an irregular heartbeat. Calculate the portion of the patients selected who have a regular heartbeat and low blood pressure.

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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.