Question 6: An examination consists of 50 multiple-choice items, each with 4 possible answers. what is the probability of guessing 25 or more correct answers?
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.
Question 5: A department store prints scratch-and-save discount coupons to distribute to its customers. The numbers for each present discount are shown in the table.
| Present Discount | Number of Each type of discount Available |
| 60% | 50 |
| 50% | 25000 |
|
30% |
50000 |
| 10% | 500,000 |
Determine the expected percent discount.
Question 6:
An examination consists of 50 multiple-choice items, each with 4 possible answers. what is the probability of guessing 25 or more correct answers?
Question 7:
A. bank found that 25% of its loans to new small business become delinquent. Ten small business are selected randomly from the bank's files.
a) what is probability that three of them are delinquent?
b) what is the probability that at least three of them are delinquent?
c) what is the expected delinquency?
B. Geometric Distribution
Q8:
Explain why rolling a die until 3 shows can be modelled by a geometric distribution
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