A student writes a test consisting of 48 multiple-choice questions. Each question has 3 choices, and only one of them is correct. He hasn’t studied anything for the test and purely guesses the answers. Let X be the number of answers that he guesses correctly. (Round your answers to 4 decimal places.) Find the mean and standard deviation of X. What is the probability that he will get exactly 14 correct answers? What is the probability that he will get 17 or more correct answers? What is the probability that he will get between 13 and 21 correct answers (including both 13 and 21)
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.
A student writes a test consisting of 48 multiple-choice questions. Each question has
3 choices, and only one of them is correct. He hasn’t studied anything for the test and
purely guesses the answers. Let X be the number of answers that he guesses correctly.
(Round your answers to 4 decimal places.)
Find the mean and standard deviation of X.
What is the probability that he will get exactly 14 correct answers?
What is the probability that he will get 17 or more correct answers?
What is the probability that he will get between 13 and 21 correct answers (including both 13 and 21)
Trending now
This is a popular solution!
Step by step
Solved in 4 steps with 4 images
