15'5 Random Variables and Probability Distribution

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15.5 Random Variables and Probability Distribution

• Random variables are used to keep track of
  possible outcomes. If a coin is flipped four
  times, the random variable (x) could
• represent the number of times that heads occurs.
  The random variable, then, assigns a numerical
  value to each specific outcome.
• TTTT 0
• HTTT 1
• HHTT 2
• HHHT 3
• HHHH 4
• The probability for each random variable can be
  calculated in several different ways
• Four chips numbered 1,2,3,4 are placed in a jar.
  Two chips are drawn at random.
• Let X the number of the numbers on the chips
  drawn. Find the probability distribution.
• 3 1/6
• 4 1/6
• 5 2/6
• 6 1/6
• 7 1/6