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The weights of an important subcomponent are normally distributed with mean of 63.7g and variation of 9g. (a) Find the probability that if 50 units

The weights of an important subcomponent are normally distributed with mean of 63.7g and variation of 9g.

(a) Find the probability that if 50 units are randomly selected, their mean weight is less than 65g. Show all working.

(b) Close examination showed that the weights are not normally distributed. Is the answer in part (a) would be changed? And why?

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