Question

Given below is the height of 20 students in centimeters

$$\begin{array}{cc}150& 178\\ 153& 156\\ 162& 184\\ 170& 176\\ 186& 173\\ 153& 186\\ 162& 159\\ 180& 183\\ 165& 180\\ 150& 156\end{array}$$

Find the number of class intervals in the frequency table if two random class intervals are 180-184 and 185-189

• A. 6
• B. 7
• C. 8
• D. 9

Answer 1

The correct option is C

8

When we arrange the heights in a grouped frequency table, we get the following table:

$$\begin{array}{cc}\text{Height}& \text{Number of students}\\ 150-154& 4\\ 155-159& 3\\ 160-164& 2\\ 165-169& 1\\ 170-174& 2\\ 175-179& 2\\ 180-184& 4\\ 185-189& 2\\ \text{Total}& 20\end{array}$$
Hence, total number of class intervals =8