(Answered) The size of stones used in a concrete blend are normally

Management Studies

The size of stones used in a concrete blend are normally distributed, with a mean diameter of 19.5mm and a standard Deviation of 1.8mm

a) What is the probability that a stone taken at random will have a diameter greater than 18mm

b) The smallest 15.15% of the stones are to be removed by passing them over a sieve. What size should the holes in the sieve be? (ie: below what size will the stones be rejected)

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