बारम्बारता बटन का बहुलक ज्ञात कीजिए |
`{:(" वर्ग अन्तराल :",0-10,10-20,20-30,30-40,40-50,50-60,60-70,70-80),(" बारम्बारता : "," "5," "25," "39," "41," "36," "17," "15," "12):}`

Answer

46.67