Assume a steady smoker spends on average 20 with a standard, Ask an Expert

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Suppose a research firm conducted a survey to determine the average amount of money steady smokers spend on cigarettes during a week. A sample of 100 steady smokers revealed that the sample mean is $20 and the sample standard deviation is $5.

Assume a steady smoker spends on average $20 with a standard deviation of $5 per week on cigarettes.

What is the probability that a sample of 100 steady smokers spend between $19.50 and $21?

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