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The amounts of nicotine in a certain brand of cigarette are normally distributed with a mean...

The amounts of nicotine in a certain brand of cigarette are normally distributed with a mean of 0.939 g and a standard deviation of 0.302 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 41 cigarettes with a mean nicotine amount of 0.849 g. Assuming that the given mean and standard deviation have NOT changed, find the probability of randomly selecting 41 cigarettes with a mean of 0.849 g or less.

P( M < 0.849 g) =

Math   Statistics-And-Probability   
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