Approximately what is the mean success score for those who wanted to quit in the hypnosis group? 
Definitions:
Excess Quantity
A situation where the supply of a product exceeds the demand for it.
Consumer Surplus
is the difference between the total amount that consumers are willing to pay for a good or service and the total amount that they actually pay.
Market Price
The immediate rate at which an asset or service can be traded in a specific trading place.
Producer Surplus
The gap between what sellers are prepared to accept for a product or service and the real amount they end up getting.
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