Lecture 4 - Mendel + Probabilities

• The rules of probability - the multiplicative rule (using AND)

  • If the events of getting a spade and the event of getting an Ace are independent, the probability that they occur together is the product of their individual probabilities of occurrence
  • Spade you have a 1/4 chance out of all suits (0.25)
  • Ace you have a 1/13 chance out of all numbers (0.077)
  • If the events A and B are independent, the probability that they occur together is the product of their individual probabilities of occurrence
  • P(A) x P(B) --> P is the probability
• The rules of probability - the additive rule (using OR)

  • If the events of A and B are independent and do not overlap, the probability that the at least one of them occurs is the sum of their individual probabilities
  • P(RR) + P(Rr)
• More on this in lecture notes, hard to put into this