A research firm conducted a study to determine the average amount of money that smokers spend on cigarettes during a week. The firm found that the population mean amount that all smokers spend on cigarettes is $20 and the population standard deviation is $5. What is the probability that a new sample this year of 100 steady smokers spends between $19 and $21 on average?
Added by Domingo C.
Step 1
5 = -2 For $21: Z = (21 - 20) / (5 / √100) = 1 / 0.5 = 2 Show more…
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