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निम्न सारणी की माध्यिका ज्ञात कीजिए ...

निम्न सारणी की माध्यिका ज्ञात कीजिए
`{:("वर्गान्तर ", " आवृत्ति "),(0-10," "4),(10-20," "6),(20-30," "10),(30-40," "7),(40-50," "3),(50-60," "2):}`

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