The marks of 30 students in a class are given below.
20, 22, 22, 25, 26, 26, 0, 10, 0, 25, 22, 23, 22, 24, 22, 24, 25, 23, 21, 25, 28, 29, 30, 27, 22, 24, 22, 25, 0, 10
What is the frequency of the mark 22?
Answer & explanation
Correct answer: option 4
The correct answer is Option (4) → 7
The frequency of a value is the number of times it occurs in the data, so the 22s are counted in order.
First ten marks: 20, 22, 22, 25, 26, 26, 0, 10, 0, 25 \(\rightarrow\) 2
Next ten marks: 22, 23, 22, 24, 22, 24, 25, 23, 21, 25 \(\rightarrow\) 3
Last ten marks: 28, 29, 30, 27, 22, 24, 22, 25, 0, 10 \(\rightarrow\) 2
Total \(=2+3+2=7\)
The frequency of the mark 22 is 7.