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Suppose a research firm conducted a survey to determine the mean amount steady smokers spend on cigarettes during a week. A sample of 140 steady

Suppose a research firm conducted a survey to determine the mean amount steady smokers spend on cigarettes during a week. A sample of 140 steady smokers revealed that the sample mean is $20. The population standard deviation is $5. What is the probability that a sample of 140 steady smokers spend between $19 and $21?

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