A survey of all the students in your school yields the following probability distribution, where X is the number of movies that a selected student has seen in the past week. Number of Movies 0 1 2 3 4 Probability 0.5 0.1 0.1 0.2 0.1 Compute the expected value ? and the standard deviation ? of X. (Round answers to one decimal place.) ?= movies?= movies For what percentage of students is X within two standard deviations of ?? %
A survey of all the students in your school yields the following probability distribution, where X is the number of movies that a selected student has seen in the past week. Number of Movies 0 1 2 3 4 Probability 0.5 0.1 0.1 0.2 0.1 Compute the expected value ? and the standard deviation ? of X. (Round answers to one decimal place.) ?= movies?= movies For what percentage of students is X within two standard deviations of ?? %
Glencoe Algebra 1, Student Edition, 9780079039897, 0079039898, 2018
18th Edition
ISBN:9780079039897
Author:Carter
Publisher:Carter
Chapter10: Statistics
Section10.3: Measures Of Spread
Problem 11PPS
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A survey of all the students in your school yields the following probability distribution, where X is the number of movies that a selected student has seen in the past week.
Number of Movies | 0 | 1 | 2 | 3 | 4 |
---|---|---|---|---|---|
Probability | 0.5 | 0.1 | 0.1 | 0.2 | 0.1 |
Compute the expected value ? and the standard deviation ? of X. (Round answers to one decimal place.)
?= movies?= movies
For what percentage of students is X within two standard deviations of ??
%
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