The weights of steel sheets produced by a factory are known to be normally distributed with
mean 32.5 kg
and standard deviation 2.2 kg.
a Find the percentage of sheets that weigh less than 30 kg.
(1 mark)
Bob requires sheets that weigh between 31.6 kg and 34.8 kg.
b Find the percentage of sheets produced that satisfy Bob's requirements.
(3 marks)