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Ten shelter animals have ages that add up to 78 years. What is the sample mean age?
AThe mean is 8.5 years
BThe mean is 7.0 years
CThe mean is 6.8 years
DThe mean is 7.8 years
Answer & Solution
Correct answer: D. The mean is 7.8 years
1. The sample mean is the sum of the values divided by how many values there are.
2. The ages add up to 78 years across 10 animals.
3. Dividing 78 by 10 gives a sample mean age of 7.8 years.
_Source: OpenStax Introductory Business Statistics (CC BY 4.0), Ch 2 "Descriptive Statistics", section 2.4 Sigma Notation and Calculating the Arithmetic Mean_
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