Question

Consider the following frequency distribution table:

Observations	Frequency	Tally Marks
10	3	|||
15	4	||||
20	X	Y
25	8	|||| |||

It is known that the total frequency is 20. What are the values of X andY?

• A.
  X = 3
• B.
  X = 5
• C.
  Y = ||||
• D.
  Y = ||||

Answer 1

Answer: (B), (D)

The correct options are
B
X = 5
D

Y = ||||
Total frequency = 20

$\Rightarrow$ 3 +4 +X +8 = 20
$\Rightarrow$ X = 5

The tally mark for 5 is ||||

Hence, Y = ||||

Therefore (b), (d) are the required answers