Given below is a frequency distribution table.

Solution:

(a) What is the lower limit of the second class interval?

The lower limit of the second class interval 20 – 30 is 20.

(b) What is the upper limit of the last class interval?

The upper limit of the last class interval 50 – 60 is 60.

(c) What is the frequency of the third class?

The frequency of the third class 30 – 40 is 4.

(d) Which interval has a frequency of 10?

Second class interval 20 – 30 has a frequency of 10.

(e) Which interval has the lowest frequency?

Third interval 30 – 40 has the lowest frequency i.e. 4.

(f) What is the class size?

The difference between the upper and lower limit of a class interval is called the Size of the class interval.

Size = Upper limit – Lower limit

= 20 – 10

= 10