Suppose x has a distribution with a mean of 20 and a standard deviation of 4. Random samples of size n = 64 are drawn. (a)  Describe the  distribution.  has a normal distribution.  has a binomial distribution.      has a geometric distribution.  has an unknown distribution.  has a Poisson distribution.  has an approximately normal distribution.   Compute the mean and standard deviation of the distribution. (For each answer, enter a number.) (b)  Find the z value corresponding to  = 21. (Enter an exact number.) z = (c)  Find P( < 21). (Enter a number. Round your answer to four decimal places.) P( < 21)

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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.