Suppose a Research Firm Conducted a Survey to Determine the Mean

Multiple Choice

Suppose a research firm conducted a survey to determine the mean amount 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?

A) 0.4772
B) 0.0228
C) 0.9544
D) 1.0000