Edexcel S1 2012 January — Question 7

Exam BoardEdexcel
ModuleS1 (Statistics 1)
Year2012
SessionJanuary
TopicNormal Distribution
TypeIndependent events across days/trials

  1. A manufacturer fills jars with coffee. The weight of coffee, \(W\) grams, in a jar can be modelled by a normal distribution with mean 232 grams and standard deviation 5 grams.
    1. Find \(\mathrm { P } ( W < 224 )\).
    2. Find the value of \(w\) such that \(\mathrm { P } ( 232 < W < w ) = 0.20\)
    Two jars of coffee are selected at random.
  2. Find the probability that only one of the jars contains between 232 grams and \(w\) grams of coffee.