CAIE S1 2022 November — Question 5

Exam BoardCAIE
ModuleS1 (Statistics 1)
Year2022
SessionNovember
TopicBinomial Distribution
TypeCombined probability with other distributions

5 Company \(A\) produces bags of sugar. An inspector finds that on average \(10 \%\) of the bags are underweight. 10 of the bags are chosen at random.
  1. Find the probability that fewer than 3 of these bags are underweight.
    The weights of the bags of sugar produced by company \(B\) are normally distributed with mean 1.04 kg and standard deviation 0.06 kg .
  2. Find the probability that a randomly chosen bag produced by company \(B\) weighs more than 1.11 kg .
    \(81 \%\) of the bags of sugar produced by company \(B\) weigh less than \(w \mathrm {~kg}\).
  3. Find the value of \(w\).