Sand is packed into bags which are then weighed on scales. It is known that if full bags of sand are intended to weigh u kg, then the weight recorded by the scales will be normally distributed with a mean u kg and a standard deviation of 0.36 kg How many times would a full sack have to be weighed so that the estimate of the weight would be within 0.2 kg of the true weight with 99.5% confidence? Select one: O a 45 Ob 56 Oc 26 Od. The correct answer is not listed Oe 85

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Sand is packed into bags which are then weighed on scales. It is known that if full bags of sand are intended to weigh u
kg, then the weight recorded by the scales will be normally distributed with a mean u kg and a standard devlation of
0.36 kg.
How many times would a full sack have to be weighed so that the estimate of the weight would be within 0.2 kg
of the true weight with 99.5% confidence?
Select one:
O a 45
Ob. 56
OC 26
Od. The corect answer is not listed
O e 85
Transcribed Image Text:Sand is packed into bags which are then weighed on scales. It is known that if full bags of sand are intended to weigh u kg, then the weight recorded by the scales will be normally distributed with a mean u kg and a standard devlation of 0.36 kg. How many times would a full sack have to be weighed so that the estimate of the weight would be within 0.2 kg of the true weight with 99.5% confidence? Select one: O a 45 Ob. 56 OC 26 Od. The corect answer is not listed O e 85
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