PROBABILITY

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PROBABILITY

• Vall Rasaratnam

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• AND Multiply
• OR Add Probabilities
• Not 1 - Probabilities

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EXERCISE 1

• If a die is tossed and a card id drawn from a
  pack, find thee probability of obtaining a six
  and an Ace
• Find the probability that if a card is drawn at
  random it is either a King or an Ace

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EXERCISE 2

• What is the probability of winning the Lotto with
  one line
• A number is chosen at random from the integers 1
  to 20. What is the probability it is an even
  number of divisible by 3

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EXERCISE 3

• A bag contains 20 marbles, of which 7 are red and
  the remainder are blue. Two marbles are removed
  one at a time without replacement. Find the
  probability that the first marble is blue and the
  second marble is red.

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EXERCISE 4

• A fair coin is tossed three times. Find the
  probability that there will be appear
• 3 heads
• 2 heads and 1 tail
• No heads

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EXERCISE 5

• A box contains 8 items of which 3 are defective,
  and box B contains 5 items of which 2 are
  defective. An item is drawn at random from each
  box. What is the probability that
• Both items are defective
• One item is defective and one is not

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EXERCISE 6

• A class has 14 boys and 5 girls. If three
  students are selected at random from the class
  what is the probability that
• They are all boys
• 2 boys and 1 girl
• 2 girls and 1 boy

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EXERCISE 7

• A tin contains five chocolate biscuits and ten
  plain biscuits. What is the probability of
  selecting a chocolate biscuit first followed by a
  plain biscuit assuming that the first biscuit is
  not put back in the tin

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EXERCISE 8

• What is the probability of throwing two fair dice
  and the first landing on a three and the second
  landing on a number four or higher