A cell phone company wants to determine if the use of text messaging is independent of age.The following data has been collected from a random sample of customers. 
Based on the data above what is the expected value for the "under 21 and regularly use text messaging" cell?
Definitions:
Neural Circuits
Networks of neurons that work together to execute a specific function or process.
Neural Changes
Refers to the alterations in the structure, function, or chemistry of nerve cells (neurons) in the brain and nervous system, often as a result of learning, experience, or injury.
Dishabituation
refers to the reinstatement or increase in responsiveness to a stimulus after a change in the situation has temporarily disrupted habituation.
Rock "n" Roll
A genre of popular music originating in the 1950s, characterized by a strong rhythm, simple melodies, and often featuring guitars and drums.
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