Any one know this it’s exponential growth and decay

()1. how do you find range? 2.the following set of data is to be organized into a histogram. if there are to be five intervals on the graph, what should the length of each interval be? 30, 34, 23, 21, 27, 25, 29, 29, 25, 23, 32, 31

Anyone know? will mark brainliest if you're correct!

Hi my sisters and brothers can tell me the answer because i don’t understand the question