What do the words "frequency" and "intervals" mean in mathematics? I am asked to solve a problem having to do with statistics Which states:

Make a frequency table for the data. Use intervals 61-70. It gives a list of numbers, such as 65, 70, 70, 85, ect. on the top line, and 96, 68, 94, 100, ect. on the bottom line, but it doesn't explain what they mean. I need an answer as soon aas possible.