A student creates a survey to see how many computers households own in a specific neighborhood. Of 500 responses, 54 households

Question

A student creates a survey to see how many computers households own in a specific neighborhood. Of 500 responses, 54 households own no computers, 129 households own one computer, 97 households own two computers, and 220 households own three computers. In this neighborhood, what is the expected number of computers owned per household? 
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