We are interested in knowing if the following frequency distribution is normally distributed. The population mean and standard deviation of the data are 600 and 160, respectively. 
What are the standard normal z-statistic class limits for the "400 up to 600" class?
Definitions:
Super-Event
A major event or happening that has significant, often transformative effects on the societies, economies, or environments it impacts.
Disaster Risk
The potential loss or damage that could occur to a system, society, or community in a specific period due to disasters.
Suppliers
Businesses or individuals that provide goods or services to another entity under terms specified in a contract or agreement.
Great East Japan Earthquake
A magnitude 9.0 undersea earthquake off the Pacific coast of Japan, occurred on March 11, 2011, causing widespread damage and triggering a tsunami.
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