PLEASE HELP! Find the variance and standard deviation. Round to the hundredth decimal place.

Class limits Frequency
2.1-2.7 15
2.8-3.4 13
3.5-4.1 8
4.2-4.8 6
4.9-5.5 2
5.6-6.2 1

Ten times the square of a non-zero number is eqaul to ninety times the number

Vinny is interviewing for a job.he wants his take home pay to be at least $42,000.what is the least salary he can earn if he pays 25% income tax?

Reading tests are compared for two students. sara got 98, 100, 65, 78, 98, 46, 100, 100, 45, and 50 on her reading test. lee got 97, 67, 89, 99, 100, 45, 79, 89, 58, and 67 on his reading test.