Solve: At the high school, 1/3 of the students play an instrument. Of the students who play an instrument, 2/3 play a string instrument. What fraction of the students at the high school play a string instrument?

Ameteorologist is studying the monthly rainfall in a section of the brazilian rainforest. she recorded the monthly rainfall, in inches, for last year. they were: 10.4, 10.3, 11.7, 11.1, 8.0, 4.4, 2.6, 1.8, 2.5, 4.4, 7.3, 9.5 fill in the missing values in the formula. what is the variance?