Richard works in a café for six hours a day and is paid $6 per hour for any extra time worked. if richard worked 6.5 hours on monday, 6 and a half hours on tuesday, 6 hours on wednesday, 6 hours on thursday, and 6 hours and 30 minutes on friday, how much extra money will richard earn that week?

Twelve different video games showing substance use were observed and the duration times of game play (in seconds) are listed below. the design of the study justifies the assumption that the sample can be treated as a simple random sample. use the data to construct a 99% confidence interval estimate of μ, the mean duration of game play. 4028 4316 4816 4650 4036 5010 4833 4331 4307