Find probability that sample of steady smokes spend in range


Suppose a research firm conducted a study 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 standard deviation is $5. What is the probability that a sample of 100 steady smokes spend between $19 and $21?

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Basic Statistics: Find probability that sample of steady smokes spend in range
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