Calculate the probability that 
where 
and 
are random variables with joint probability density 
Definitions:
River Channel
The physical confine of a river, consisting of a bed and banks, within which water flows in a significantly regulated manner.
Ultraviolet Energy
Electromagnetic radiation with a wavelength shorter than visible light but longer than X-rays, capable of producing chemical reactions and causing sunburn.
External Energy Source
An energy source that originates outside a system and can influence or drive processes within that system, such as solar radiation impacting the Earth's climate.
Infrared Energy
A form of electromagnetic energy with longer wavelengths than visible light; much of the Sun’s light that reaches Earth converts into this type of energy.
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