Exam 1

1. Metainformation

   Tag	Value
   file	Probability_uva-variance-1125-en_uva-variance-1125-en
   name	uva-variance-1125-en
   section	Probability/Elementary Probability/Random variables/Variance
   type	schoice
   solution	FALSE, FALSE, TRUE, FALSE
   Type	Conceptual
   Language	English
   Level	Statistical Literacy
   IRT-Difficulty	2
   p-value	0.5905

   Question

   A random variable X has the following probability distribution:_____________.
   

   ————– —— —— —— TRUE of X -2 0 2 Odds 0.25 0.50 0.25 ————– —— —— ——

    Then what is the standard deviation of X?

   
   
   1. FALSE: 0
   2. FALSE: 1
   3. TRUE: 1,41
   4. FALSE: 2,24
   
   
   1. 0: Incorrect
   2. 1: Incorrect
   3. 1.41: Correct
   4. 2.24: Incorrect