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:
Sexual Orientation
An enduring pattern of emotional, romantic, or sexual attractions to men, women, or both sexes, seen as part of a continuum or a distinct category.
Leptin
A hormone produced by adipose (fat) cells that regulates energy balance by inhibiting hunger, which in turn diminishes fat storage in adipocytes.
Regulating Appetite
Regulating Appetite involves physiological and psychological mechanisms that control food intake, influenced by factors such as hormonal signals, presence of food, and learned behaviors.
Predominantly Homosexual
Refers to individuals whose sexual and emotional attraction is primarily towards people of the same sex.
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