निम्नलिखित आँकड़ों का समान्तर माध्य ज्ञात कीजिए :
Find out the arithmetic mean of the following data :
प्राप्तांक
विद्यार्थियों की संख्या
( (Marks obtained)
(No. of students)
10-20
50
20-30
40
30-40
35
40-50
25
50-60
10
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Answer:
Mean = Sum of all classes/no. of classes
= 50 + 40 + 35 + 25 + 10/5
= 160/5
= 32. ( approx.)
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