1. Milk cartons are advertised to contain one litre of milk. From a randomly sample of 18 one-litre cartons whose contents were accurately measured by the South African Bureau of Standards (SABS), it was found that the average fill was 0.98 litres with a sample standarddeviationof0.052litres.Assumethatthefillofone-litremilkcartonsisnormally distributed.
   1. Usinga99%confidencelevel,estimatetheactualmeanfillofallone-litremilkcartons. Interpret your findings and comment onthe question.(4)
   2. Repeat the exercise in (i)above, but use 90%confidence level. (4)

3. Explain any differences in the findingscomputedabove. (2)