A pair of dice are rolled. Let X be a random variable that denotes the sum of the number of dots that appear. What is the mean, variance and standard deviation of the random variable X?

A First Course in Probability (10th Edition)
10th Edition
ISBN:9780134753119
Author:Sheldon Ross
Publisher:Sheldon Ross
Chapter1: Combinatorial Analysis
Section: Chapter Questions
Problem 1.1P: a. How many different 7-place license plates are possible if the first 2 places are for letters and...
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A pair of dice are rolled. Let X be a random variable that denotes the sum of the number of dots that appear. What is the mean, variance and standard deviation of the random variable X?

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