In a parking lot, 15% of the cars are blue. there are 12 blue cars in the parking lot. how many total cars are there? how many cars in the parking lot are not blue?

I'm confused on this could anyone me and show me what i need to do to solve it.

Abag contains pieces of paper numbered from 5 to 9. a piece of paper is drawn at random. what is the theoretical probability of drawing a number less than 8?

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?