WJEC Further Unit 5 2022 June — Question 2

Exam BoardWJEC
ModuleFurther Unit 5 (Further Unit 5)
Year2022
SessionJune
TopicLinear combinations of normal random variables
TypeSum versus sum comparison

2. Geraint is a beekeeper. The amounts of honey, \(X \mathrm {~kg}\), that he collects annually, from each hive are modelled by the normal distribution \(\mathrm { N } \left( 15,5 ^ { 2 } \right)\). At location \(A\), Geraint has three hives and at location \(B\) he has five hives. You may assume that the amounts of honey collected from the eight hives are independent of each other.
    1. Find the probability that Geraint collects more than 14 kg of honey from the first hive at location \(A\).
    2. Find the probability that he collects more than 14 kg of honey from exactly two out of the three hives at location \(A\).
  1. Find the probability that the total amount of honey that Geraint collects from all eight hives is more than 160 kg .
  2. Find the probability that Geraint collects at least twice as much honey from location B as from location A.