CAIE S1 2024 November — Question 5

Exam BoardCAIE
ModuleS1 (Statistics 1)
Year2024
SessionNovember
TopicNormal Distribution
TypeNormal approximation to binomial

5 The weights of the green apples sold by a shop are normally distributed with mean 90 grams and standard deviation 8 grams.
  1. Find the probability that a randomly chosen green apple weighs between 83 grams and 95 grams.
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  2. The shop also sells red apples. \(60 \%\) of the red apples sold by the shop weigh more than 80 grams. 160 red apples are chosen at random from the shop. Use a suitable approximation to find the probability that fewer than 105 of the chosen red apples weigh more than 80 grams.