*JUST THIS ONE* please help i need the answer and ill give brainlest

What situation is an example of an observational study

Suppose that an airline uses a seat width of 16.516.5 in. assume men have hip breadths that are normally distributed with a mean of 14.414.4 in. and a standard deviation of 0.90.9 in. complete parts (a) through (c) below. (a) find the probability that if an individual man is randomly selected, his hip breadth will be greater than 16.516.5 in. the probability is nothing. (round to four decimal places as needed.)

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