The amounts of nicotine in a certain brand of cigarette are normally distributed with a mean of 0.948 g and a standard deviation of 0.301 g. The company that produces these cigarettes claims that it...

The amounts of nicotine in a certain brand of cigarette are normally distributed with a mean of 0.948 g and a standard deviation of 0.301 g. The company that produces these cigarettes claims that it has now reduced the amount of nicotine. The supporting evidence consists of a sample of 42 cigarettes with a mean nicotine amount of 0.888 g.


Assuming that the given mean and standard deviationhave NOT changed, find the probability of randomly seleting 42 cigarettes with a mean of 0.888 gor less.
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