Hannah works as a carpenter and as a blacksmith she earns $20 per hour as a carpenter and $25 per hour As a blacksmith last week she earned a total of $1050 she were twice as many hours as a blacksmith As a carpenter how long did Hannah work as a carpenter last week and how long did she work as a blacksmith?

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