Question

class mark of class interval 70-80 is _______
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Answer 1

Answer:

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$here \: is \: your \: answer$

75 ɪs ᴛʜᴇ ᴄʟᴀss ᴍᴀʀᴋ ᴏғ ɪɴᴛᴇʀᴠᴀʟ

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Answer 2

Answer:

ans is 75

formulae= lower class +upper class /2

so 70+80/2=75

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