Edexcel S2 — Question 5

Exam BoardEdexcel
ModuleS2 (Statistics 2)
TopicApproximating Binomial to Normal Distribution
TypeCombined binomial and normal events

  1. Lupin seeds are sold in packets of 15 . On average, 9 seeds in a packet are green and 6 are red. Find, to 2 decimal places, the probability that in any particular packet there are
    1. less than 2 red seeds,
    2. more red than green seeds.
    The seeds from 10 packets are then combined together.
  2. Use a suitable approximation to find the probability that the total number of green seeds is more than 100 .