The town of worman grove has collected 28,481 pens for school supplies drive. Their goal is 30,000 pens .Show how to use counting on to find how many more pens they need to reach their goal.

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?