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 "800 up to 1000" class?
Definitions:
Customs Brokerage Firm
A company that specializes in facilitating the import and export of goods, helping businesses navigate through customs regulations and procedures.
Department of External Affairs
An historical term used for the government department in some countries responsible for foreign relations and diplomacy, now often referred to as the Ministry of Foreign Affairs.
Trade Missions
Official trips organized by governments or trade associations aimed at exploring international business opportunities and fostering economic relations.
Loan Guarantees
Financial guarantees provided by a third party (like a government or financial institution) ensuring loan repayment in case the borrower defaults.
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