The following probability distribution has been assessed for the number of accidents that occur in a Midwestern city each day: 
Based on this probability distribution,the standard deviation in the number of accidents per day is:
Definitions:
IQ
Intelligence Quotient (IQ) is a measure used to assess human intelligence, derived from standardized tests.
Cultural Differences
The variations in practices, beliefs, and norms observed among various ethnic, regional, or national groups.
Genetic Differences
Variations in the DNA sequences among individuals, which contribute to the unique physical and behavioral traits of each person.
Environmental Factors
External elements including climate, ecosystem, and all living and non-living things that affect an individual or population.
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