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The Lola cereal company claims that the average weight of a cereal box is at least...

The Lola cereal company claims that the average weight of a cereal box is at least 650 grams. Gordon has calculated the average weight of a sample of 25 boxes of cereal to be 620 grams with the standard deviation of 20 grams. Is this providing enough evidence that the average box of cereal is at least 650 grams? Test this hypothesis at 0.1 significance level.
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