Some Important Terminologies

Substituting the values in the formula 

MTBF=(total operational uptime between failures / number of failures) 

we get

MTBF = ((10,000 + 9,500 + 11,000 + 9,000)/4) = 9,875

That means the manufacturer has approximately 9,875 hours of uptime on this network switch before it experiences a failure.

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