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A statistician who works for an insurance company or other organization that assesses risk. The actuary computes various risk factors and determines the likelihood of whether (or when) an event will occur. For example, an actuary will look at a person's medical information, such as height, weight, and pre-existing conditions, and mathematically determine how likely it is that the person will cost the insurance company more than he/she will pay in premiums. This helps the insurance company decide whether the person will receive coverage and, if so, what the monthly premium will be.