निम्न सारिणी 140 विद्यार्थियों के द्वारा...

निम्न सारिणी 140 विद्यार्थियों के द्वारा एक निश्चित प्रश्नपत्र में परीक्षा में प्राप्त किये गये अंको को दर्शाती है |
`{:(" अंक : ",0-10,10-20,20-30,30-40,40-50),("विद्यार्थियों की संख्या : ", " "20," "24," "40," "36," "20):}`
औसत अंको की गणना कीजिए |

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