लघु विधि द्वारा माध्य, प्रसरण तथा मानक विचलन ज्ञात कीजिए
आयु (वर्षो में)
20-25
25-30
30-35
35-40
40-45
45-50
50-55
12.
श्रमिकों की संख्या
15
30
45
20
24
25
10
Answers
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19
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Answer:
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