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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 53 times)

NClaborn

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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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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
YES! Correct, THANKS for helping me on my review


nanny

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Reply 3 on: Yesterday
Gracias!

 

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