years old and older were asked how frequently they are in touch with their parents by phone. The results of the poll are as follows. Answer Monthly Weekly Daily Don't know Less Respondents (%) 11 47 34 2 6 A person who participated in the poll is selected at random. (a) What is the probability that the person said he or she kept in touch with his or her parents once a week? (b) What is the probability that the person said he or she kept in touch with his or her parents at least once a week?
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.
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In a poll conducted by a research center in a certain year, 2000 adults ages 18 years old and older were asked how frequently they are in touch with their parents by phone. The results of the poll are as follows.
| Answer | Monthly | Weekly | Daily | Don't know | Less |
|---|---|---|---|---|---|
| Respondents (%) | 11 | 47 | 34 | 2 | 6 |
A person who participated in the poll is selected at random.
(b) What is the probability that the person said he or she kept in touch with his or her parents at least once a week?
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