9 A farmer expects to harvest a crop of 3.8 tonnes, on average, from each hectare of his land, with standard deviation 0.2 tonnes. One year there was much more rain than usual and he harvested 4.1...

Extracted text: 9 A farmer expects to harvest a crop of 3.8 tonnes, on average, from each hectare of his land, with standard deviation 0.2 tonnes. One year there was much more rain than usual and he harvested 4.1 tonnes per hectare. (i) Was this exceptional? (ii) Do you think the crop was affected by the unusual weather or was the higher yield part of the variability which always occurs?