Question

please answer it fast guys please please please please​

Answer 1

Remember, in this question, the no. of students that are given are not actually frequency but they are cumulative frequencies. This is because, 6 is the frequency of the class limit 0 to 10, but 15 is the frequency of class limit 0 to 20 and not 10 to 20. This meansno, 15 is the total frequency of class limit 0 to 10 and 10 to 20, which means 15 is the cumulative frequency. Similarly, the other numbers that are given are also cumulative frequencies.