Edexcel S2 2014 January — Question 1

Exam BoardEdexcel
ModuleS2 (Statistics 2)
Year2014
SessionJanuary
TopicApproximating Binomial to Normal Distribution
TypeCombined binomial and normal events

  1. The probability of a leaf cutting successfully taking root is 0.05
Find the probability that, in a batch of 10 randomly selected leaf cuttings, the number taking root will be
    1. exactly 1
    2. more than 2 A second random sample of 160 leaf cuttings is selected.
  1. Using a suitable approximation, estimate the probability of at least 10 leaf cuttings taking root.