Exam 1

1. Metainformation

   Tag	Value
   file	Probability_uva-expected-value-1124-en_uva-expected-value-1124-en
   name	uva-expected-value-1124-en
   section	Probability/Elementary Probability/Random variables/Expected value
   type	schoice
   solution	FALSE, FALSE, FALSE, TRUE
   Type	Conceptual
   Language	English
   Level	Statistical Literacy
   IRT-Difficulty	1.999
   p-value	0.7751

   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 variance of X?

   
   
   1. FALSE: -2
   2. FALSE: 0
   3. FALSE: 0,5
   4. TRUE: 2
   
   
   1. 2: Incorrect
   2. 0: Incorrect
   3. 0.5: Incorrect
   4. 2: Correct