statistics

It is claimed that an automobile is driven on the average more than 20,000 kilometers per year. Random sample of 10 automobile owners are asked to keep a record of the kilometers they travel. If the sample mean and standard deviation of automobile driven are found to be 23,500 kilograms and 3900 kilometers respectively, assuming that the kilometers they travel is normally distributed. Test this claim at the 0.05 level of significance.

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