Mathematics, 12.11.2019 22:31 shakebays

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. what is the probability that a sample of 100 steady smokers spend between $19 and $21?
answer
0.4772
0.0228
0.9544
$20

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