A company wants to find the average weight of its products. A large initial sample shows the standard deviation of the weight is 20 g. What sample size would give a 95% confidence interval for the population that is

(a) 10 g wide,

(b) 8 g wide,

(c) 5 g wide?

(a) 10 g wide,

(b) 8 g wide,

(c) 5 g wide?

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