#### Fill in the blanks :

(i) The number of observations in a particular class is called ……of the class.

(ii) The difference between the class marks of two consecutive classes is the

of the class.

(iii) The range of the data 16, 19, 23, 13, 11, 25, 18 is…

(iv) The mid-point of the class interval is called its …

(v) The class mark of the class 4 – 9 is ….

**Solution:**

(i) The number of observations in a particular class is called frequency of the class.

(ii) The difference between the class marks of two consecutive classes is the size of the class.

(iii) The range of the data 16, 19, 23, 13, 11, 25, 18 is 14.

(iv) The mid-point of the class interval is called its class marks.

(v) The class mark of the class 4 – 9 is 6.5. [Class mark = (4 + 9)/2 = 13/2 = 6.5]

**More Solutions:**

- Find the mean of 8, 6, 10, 12, 1, 3, 4, 4.
- The enrollment of a school during six consecutive years.
- Find the mean of the first six prime numbers.
- Find the mean marks obtained by the group of students.
- Find the excluded number.
- Find the third observation.
- What is the new mean weight?
- A student scored the following marks in 11 questions:
- Calculate the mean and the median of the numbers: