What are the next two terms of the geometric sequence? 80, 20, 5, 1.25, ...

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He weights of 2-pound bags of best dog food are approximately normally distributed with a given mean  and standard deviation  according to the empirical rule, what percentage of the bags will have weights within 3 standard deviations of the mean? 47.5%68%95%99.7%

Solve this problem! extra ! 3025/5.5 = a/90.75