Edexcel S1 2017 January — Question 2

Exam BoardEdexcel
ModuleS1 (Statistics 1)
Year2017
SessionJanuary
TopicProbability Definitions
TypeVenn diagram completion

  1. An integer is selected at random from the integers 1 to 50 inclusive.
    \(A\) is the event that the integer selected is prime.
    \(B\) is the event that the integer selected ends in a 3
    \(C\) is the event that the integer selected is greater than 20
    The Venn diagram shows the number of integers in each region for the events \(A , B\) and \(C\)
    \includegraphics[max width=\textwidth, alt={}, center]{1130517e-33d0-41b1-9303-2d981379954d-04_607_1125_593_413}
    1. Describe in words the event \(( A \cap B )\)
    2. Write down the probability that the integer selected is prime.
    3. Find \(\mathrm { P } \left( [ A \cup B \cup C ] ^ { \prime } \right)\)
    Given that the integer selected is greater than 20
  2. find the probability that it is prime. Using your answers to (b) and (d),
  3. state, with a reason, whether or not the events \(A\) and \(C\) are statistically independent. Given that the integer selected is greater than 20 and prime,
  4. find the probability that it ends in a 3