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GLL insurance company often tracks life expectancy information to determine life insurance policies for its policyholders. Two years ago, the average life expectancy of all

GLL insurance company often tracks life expectancy information to determine life insurance policies for its policyholders. Two years ago, the average life expectancy of all policyholders was 79.6 years with a standard deviation of 3.56 years. At this time, GLL wants to estimate the average life expectancy to within one year with 99% confidence. How many randomly selected recently paid policies would be needed to sample?

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