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A manufacturer claims that a certain brand of VCR player has an average life expectancy of 5 years and 6 months with a standard deviation of 1 year and 6 months. Assume that the life expectancy is normally distributed.
(a) Selecting one VCR player from this brand at random, calculate the probability of its life expectancy exceeding 7 years.
(b) The Critical Consumer magazine decides to test ?fty VCRS of this brand. The average life in this sample is 6 years and the sample standard deviation is 2 years. Calculate a 99% con?dence interval for the average life.
(c) How many more VCRs would the magazine have to test in order to halve the width of the con?dence interval
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