निम्नलिखित बंटन के लिए माध्य , प्रसरण ...

निम्नलिखित बंटन के लिए माध्य , प्रसरण तथा मानक विचलन ज्ञात कीजिए :
`{:("वर्ग अंतराल ",0-10,10-20,20-30,30-40,40-50),("बारम्बारता"," "4," "13," "18," "9," "6):}`

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