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...

Extracted 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