I'm having trouble with this problem

:24% of students in a class are girls. if there are less than 30 students in this class, how many students are there? how many girls are there?

Eden has a part time job. she is paid ? 7.20 an hour the week she worked 18 and a half hours how much is she paid

For a science project, a high school research team conducted a survey of local air temperatures. based on the results of the survey, the found that the average temperatures were around 10 degrees higher than expected. this result was wrong. the trouble with the survey was that most of the locations were exposed to direct sunlight and located over asphalt or sand, which resulted in higher temperatures than normal. this is a classic example of an error in which phase of inferential statistics?