A test has 8 multiple choice questions, each with 4 choices. a. What is the probability of guessing 7 or more questions correctly? b. A test has 8 multiple choice questions, each with 5 choices. What is the probability of guessing 4 or more questions correctly? C. A test has 8 multiple choice questions, each with 5 choices. What is the probability of guessing all 8 questions correctly? 4. A research team at Cornell University conducted a study showing that approximately 10% of all businessmen who wear ties wear them so tightly that they actually reduce the blood flow to the brain, diminishing cerebral functions (Source: Chances: Risks and Odds in Everyday Life, by James Burke). At a board meeting, 20 businessmen wear ties. a. Using the binomial formula, set up the probability that 12 businessmen wear ties that are tied too tightly and then simplify. 2.

Q: What is the last digit of 123456789123456789123456789123456789?

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A: We have in general the formula for combination as, rn = n!r!(n-r)!

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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.