Question

Given below is a frequency distribution table. Read it and answer the questions that follow:

Class Interval	Frequency
10 – 20	5
20 – 30	10
30 – 40	4
40 – 50	15
50 – 60	12

1. What is the lower limit of the second class interval?
2. What is the upper limit of the last class interval?
3. What is the frequency of the third class?
4. Which interval has a frequency of 10?
5. Which interval has the lowest frequency?
6. What is the class size?

Answer 1

1. The lower limit of second class interval (20 – 30) is 20.
2. The upper limit of the last class interval (50 – 60) is 60.
3. The frequency of the third class (30 – 40) is 4.
4. The interval (20 – 30) has a frequency of 10.
5. The interval (30 – 40) has the lowest frequency, i.e. 4.
6. We know that, Class size = Upper class limit – Lower class limit
   Consider first class, i.e. 10 – 20, then class size = 20 – 10 = 10