An expensive piece of equipment in a laboratory is starting to show signs of age. Let X be the number of days in any week that the equipment is working and suppose that X has the following probability...

An expensive piece of equipment in a laboratory is starting to show signs of age. LetXbe the number of days in any week that the equipment is working and suppose thatXhas the following probability distribution:

The expected number of days in a week that the equipment is working is