How do you find the mean of a random variable?
The mean of a discrete random variable is the weighted mean of the values. The formula is: μx = x1*p1 + x2*p2 + hellip; + x2*p2 = Σ xipi. In other words, multiply each given value by the probability of getting that value, then add everything up.
What is an example of a discrete random variable?
If a random variable can take only a finite number of distinct values, then it must be discrete. Examples of discrete random variables include the number of children in a family, the Friday night attendance at a cinema, the number of patients in a doctor’s surgery, the number of defective light bulbs in a box of ten.
What makes a variable discrete?
A discrete variable is a variable whose value is obtained by counting. A discrete random variable X has a countable number of possible values. Example: Let X represent the sum of two dice.
How do I use normal distribution in the TI-83/84?
Normal Distribution Methods in the TI-83/84 I. Normal Probabilities 1. Normal probabilities can be computed using formulas and a Standard Normal Table, or they can be computed directly with the TI-83. Use yVARS =and scroll down to 2:normalcdf(and press Í, then enter the values for lower-limit, upper-limit, mean, and standard-deviation
What class is a TI-83 or TI-84 calculator in?
USING A TI-83 OR TI-84 SERIES GRAPHING CALCULATOR IN AN INTRODUCTORY STATISTICS CLASS USING A TI-83 OR TI-84 SERIES GRAPHING CALCULATOR IN AN INTRODUCTORY STATISTICS CLASS W. SCOTT STREET, IV DEPARTMENT OF STATISTICAL SCIENCES & OPERATIONS RESEARCH
How to find inverse normal probability with TI-83?
α 1. Inverse normal probabilities, e.g.finding Z α such that P(z≥Z α ) = α, can be computed directly with the TI-83 (thus avoiding the need to use formulas and a Standard Normal Table).
What is the viewing rectangle on the TI-83?
draws the graph of a function Using the viewing rectangle The viewing rectangle on the TI-83 is 94 pixels by 62 pixels. (A pixel is a picture element.) It is useful when graphing to have a “friendly window” in order to avoid distortion in the graph and to avoid obtaining non-integer values when using the trace function of the TI-83.