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The giant size of a new tough cleaning laundry detergent has a listed net weight of 42 ounces. From prior study, it is believed that

The giant size of a new "tough cleaning" laundry detergent has a listed net weight of 42 ounces. From prior study, it is believed that variability in weight follows a normal distribution with a standard deviation of = 2.0 ounces.

a. how many containers of laundry detergent must be sampled in order to estimate the mean fill weight to within 0.25 ounces with 90% confidence?

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