class mark of class interval 70-80 is _______
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75 ɪs ᴛʜᴇ ᴄʟᴀss ᴍᴀʀᴋ ᴏғ ɪɴᴛᴇʀᴠᴀʟ
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Answer:
ans is 75
formulae= lower class +upper class /2
so 70+80/2=75
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