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प्रश्न
The class marks of a frequency distribution are given as follows: 15, 20, 25, ... The class corresponding to the class mark 20 is ______.
विकल्प
12.5 – 17.5
17.5 – 22.5
18.5 – 21.5
19.5 – 20.5
उत्तर
The class marks of a frequency distribution are given as follows: 15, 20, 25, ... The class corresponding to the class mark 20 is 17.5 – 22.5.
Explanation:
Since, the difference between mid-value is 5.
So, the corresponding class to the class mark 20 must have difference 5.
Therefore, option (c) and (d) are wrong.
Since, the mid-value is 20 which can get only, if we take
`(17.5 + 22.5)/2 = 40/2` = 20
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