A21 inch piece of steel is cut into three pieces so that the second piece is twice as long as the first, the third piece is 3 inches more than three times the length of the first piece. find the lengths of the pieces.

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