CAIE S1 2017 June — Question 5

Exam BoardCAIE
ModuleS1 (Statistics 1)
Year2017
SessionJune
TopicPoisson Distribution
TypeSingle time period probability

5 Eggs are sold in boxes of 20. Cracked eggs occur independently and the mean number of cracked eggs in a box is 1.4 .
  1. Calculate the probability that a randomly chosen box contains exactly 2 cracked eggs.
  2. Calculate the probability that a randomly chosen box contains at least 1 cracked egg.
  3. A shop sells \(n\) of these boxes of eggs. Find the smallest value of \(n\) such that the probability of there being at least 1 cracked egg in each box sold is less than 0.01 .