Sherrie invested some money at 6% interest. Sherrie also invested $249 more than 4 times that amount at 12%. How much is invested at each rate if Sherrie receives $988.92 in interest after one year? (Round to two decimal places if necessary.)

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