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Table below summarizes the distribution of grades in Schools. What is the Expected Value of the...

  1. Table below summarizes the distribution of grades in Schools.
  1. What is the Expected Value of the grades?
  2. What is the Variance of the grades?
  3. What is the Standard Deviation of the grades? (Standard Deviation is simply square root of variance)

Grades

Probability

100

0.65

90

0.15

80

0.10

50

0.08

0

0.02
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