On the right side of a balance there are two birds that each way 12 ounces. On the left side, there's a bird that weighs 14 ounces in a bird with an unknown wait if both sides of the balance have the same weight how much does the unknown bird weigh?

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