The speed of nitrogen molecules in the atmosphere(at 20°c) follows a normal distribution with a mean speed of 500 meters/ second and a standard deviation of 50 meters/second. which conclusion does this information best support?

I'll give brainliest if you answer right : )

Marco is studying a type of mold that grows at a fast rate. he created the function f(x) = 345(1.30)x to model the number of mold spores per week. what does the 1.30 represent? how many mold spores are there after 4 weeks? round your answer to the nearest whole number. 1.30 represents the number of mold spores marco had at the beginning of the study; 985 mold spores 1.30 represents the number of mold spores grown in a given week; 448 mold spores 1.30 represents the 30% rate of weekly growth; 345 mold spores 1.30 represents the 30% rate of weekly growth; 985 mold spores

School has 204 sixth grade students. if the sixth grade is 30% of the total school, how many students are in the middle school?