Which of the following about the description of expectations and variances is incorrect?

Question

Options

• AExpectation reflects the average level of random variable values
• BThe variance reflects the degree of deviation between the random variable and its mathematical
• CExpectation and variance are both numerical characteristics of random variables
• DThe greater the expectation the smaller the variance

• A
  9% (5)
• B
  7% (4)
• C
  2% (1)
• D
  82% (47)

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