Over the Entire Six Years That Students Attend an Ohio

question 49

Multiple Choice

Over the entire six years that students attend an Ohio elementary school, they are absent, on average, 28 days due to influenza. Assume that the standard deviation over this time period is σ = 9 days. Upon graduation from elementary school, a random sample of 36 students is taken and asked how many days of school they missed due to influenza. The probability that the sample mean is between 25 and 30 school days is ________.

• A) 0.0228
• B) 0.0918
• C) 0.8860
• D) 0.9082

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