Mrs. Randolph teaches math. She has 26 students in first period, 32 students in 2nd period, 27 students in 3rd period, and 30 students in 4th period. What is the total number of students Mrs. Randolph teaches ?

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