A random sample of 30 states shows the number of low-power FM radio stations for each

state. Find the mean, modal class, variance, and standard deviation for the data below. Round answers to 2 d.p.

You take 3 tests in your stats class that are worth 100 points each. Your scores, in order, are 80, 80, and 85. The last test is much easier than the first 2 so your teacher has given it less weight. The weights for the 3 tests are:

Exam 1: 40%

Exam 2: 40%

Exam 3: 20%

Find your weighted mean for these 3 tests: