Find E(X) =  Find Var(2X + 100 - 24) =  What is the probability that a child in Sweden can speak three or more languages?  What is the probability that a child in Sweden can speak three or more languages but speak less than six languages?

Holt Mcdougal Larson Pre-algebra: Student Edition 2012
1st Edition
ISBN:9780547587776
Author:HOLT MCDOUGAL
Publisher:HOLT MCDOUGAL
Chapter11: Data Analysis And Probability
Section: Chapter Questions
Problem 8CR
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Find E(X) = 

Find Var(2X + 100 - 24) = 

What is the probability that a child in Sweden can speak three or more languages? 

What is the probability that a child in Sweden can speak three or more languages but speak less than six languages?

Let the random variable X to be the number of languages a randomly chosen child can
hold an everyday conversation in Sweden. Suppose that we take a random sample of
1000 school children in Sweden and obtain the following data for the number of languages
spoken.
1
2
3
4
5
6 Total
Frequency 663 226 66 22 19 4
1000
Transcribed Image Text:Let the random variable X to be the number of languages a randomly chosen child can hold an everyday conversation in Sweden. Suppose that we take a random sample of 1000 school children in Sweden and obtain the following data for the number of languages spoken. 1 2 3 4 5 6 Total Frequency 663 226 66 22 19 4 1000
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