A discrete random variable X follows the following distribution: X O 1 2 3 4 S probability 0.08 0.21 0.32 0.27 0.07 0.04 a) Determine the expected value for X. b) Determine the standard deviation for X. c) Find the probability that X is less than 3. d) Find the probability that X is at least 4. 6 0.01 7 or more

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