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David is deciding where to take his family to a spontaneous road trip tomorrow. There are 4 choices: Port Maquarie, Newcastle, Central Coast and Jervis Bay. These choices are written down on paper and mixed in a jar. There are twice as many paper that has Port Maquarie written down as Central Coast. If he takes on a piece of paper out of the jar without looking:

  • The probability that it is Port Maquarie is 0.5
  • The probability that it is Newcastle is 0.1

What is the probability that David picks Jervis Bay?