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Author Question: The variance of the sum of two random variables is the sum of their variances plus two times the ... (Read 17 times)

NClaborn

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on: Jun 24, 2018
The variance of the sum of two random variables is the sum of their variances plus two times the covariance.
 
  Indicate whether the statement is true or false

Question 2

Approximately what proportion of the observations is between 476 and 524?
 
  What will be an ideal response?


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iman

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Reply #1 on: Jun 24, 2018
Answer to Question 1

TRUE

Answer to Question 2

The values 476 and 524 are within  one standard deviation of the mean; hence the Empirical Rule implies that the proportion of the observations between these two values is approximately 0.68


NClaborn

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Reply 2 on: Jun 24, 2018
Gracias!

diana chang

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Reply 3 on: Yesterday
Great answer, keep it coming :)

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