Question

Following data shows the marks obtained by $30$ students in a unit test :

$$\begin{gathered} 20,25,30,24,30,25,20,19,15,10,24,25,30,24,19,30,25,15,20,24, \\ 25,30,19,19,25,24,30,19,24,20 \end{gathered}$$

Write the above data in a tabular form using tally marks and answer the following questions :

a) Find the number of students who scored more than $25$ marks.

b) If passing marks are $20$, then how many students got pass in this test ?

c) How many students scored marks between $15$ and $30?$

Answer 1

Marks	Students	Tally Marks
10	1	$⃒$$|$
15	2	$\left|\right|$
19	5	$\bcancel{\left|\right|\left|\right|}$
20	4	$\left|\right|\left|\right|$
24	6	$\bcancel{\left|\right|\left|\right|}$ $|$
25	6	$\bcancel{\left|\right|\left|\right|}$ $|$
30	6	$\bcancel{\left|\right|\left|\right|}$ $|$

a) $\mathbf{6}$ students are there who scored more than $25$ marks.

b) There are $(4+6+6+6)=\mathbf{22}$ students who got passed in this test.

c) Number of students scored marks between $15$ and $30$ are $(5+4+6+6)=\mathbf{21}$.