Which of the following Excel functions is used to determine the left-tailed 
value given any probability?
Definitions:
Biorhythm
A hypothetical cycle of physical, emotional, or intellectual fluctuations believed to affect human behavior.
Gonads
The reproductive organs in animals and humans that produce gametes (sperm in males, eggs in females); testes in males and ovaries in females.
Pituitary
A small, crucial gland located at the base of the brain responsible for regulating important functions by releasing hormones into the bloodstream.
Circadian Rhythms
Natural, internal processes that regulate the sleep-wake cycle and repeat roughly every 24 hours.
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