The random variable X is the number of people who have a college degree in a randomly selected group of four adults from a particular town. The probability distribution for this situation is listed below. X P(X = x) 0 0.4086 1 0.4108 2 0.1546 3 0.0246 4 0.0014 What is the mean of the random variable? ___________ What is the standard deviation of the random variable? __________
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.
- The random variable X is the number of people who have a college degree in a randomly selected group of four adults from a particular town. The probability distribution for this situation is listed below.
|
X |
P(X = x) |
|
|
|
|
0 |
0.4086 |
|
|
|
|
1 |
0.4108 |
|
|
|
|
2 |
0.1546 |
|
|
|
|
3 |
0.0246 |
|
|
|
|
4 |
0.0014 |
|
|
|
|
|
|
|
|
|
- What is the
mean of the random variable? ___________
- What is the standard deviation of the random variable? __________
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