Algebra-1

A group of students recorded the number of pages they read each day for a week. The results are: {10, 15, 10, 20, 15, 10, 20, 15, 10, 15, 20, 10, 15, 20, 10, 15, 20, 10, 15, 20}. Create a frequency table to find the frequency of the value 15.