Question

A wearing trial was carried out to estimate the
average life of a certain kind of garment. One
hundred people were each issued with a garment and
asked to wear it for ten hours a day, five days a
week. At the end of three weeks, four wearers
reported that their garment was worn out, and after
four weeks a further 16 wearers considered their
garment -was finished. Assuming the lives of the
garments are normally distributed, estimate the mean
and standard deviation of the garment life, and
hence estimate the proportion of garments with lives
longer than 300 hours.​

Answer 1

Answer:

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