Use the information for the question(s) below.
An exchange traded fund (ETF) is a security that represents a portfolio of individual stocks.Consider an ETF for which each share represents a portfolio of two shares of International Business Machines (IBM) ,three shares of Merck (MRK) ,and three shares of Citigroup Inc.(C) .Suppose the current market price of each individual stock are shown below: 
-The price per share of the ETF in a normal market is closest to:
Definitions:
Extinction
The gradual weakening and eventual disappearance of a conditioned response when the conditioned stimulus is no longer paired with the unconditioned stimulus.
Successive Approximations
A behavior training process where closer and closer approximations to a desired behavior are reinforced until the desired behavior is achieved.
Shaping
A method of conditioning by which successive approximations towards a desired behavior are reinforced, gradually guiding the behavior closer to the target.
Contingency Management
A behavioral intervention strategy that modifies the consequences of behaviors to increase or decrease those behaviors.
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