A sample of 22 households uses an average of 346.2 gallons of water per day, with a sample standard deviation of 50.5 gallons. You can safely assume that the population of household water useage is...

A sample of 22 households uses an average of 346.2 gallons of water per day, with a sample standard deviation of 50.5 gallons. You can safely assume that the population of household water useage is Normally distributed. Construct a 95% Confidence Interval for the mean.