the average of upper and lower limit is. a class mark
b class size
c class
d none
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ᴄʟᴀss ᴍɪᴅᴘᴏɪɴᴛ
ᴛʜᴇ ᴄʟᴀss ᴍɪᴅᴘᴏɪɴᴛ (ᴏʀ ᴄʟᴀss ᴍᴀʀᴋ) ɪs ᴀ sᴘᴇᴄɪғɪᴄ ᴘᴏɪɴᴛ ɪɴ ᴛʜᴇ ᴄᴇɴᴛᴇʀ ᴏғ ᴛʜᴇ ʙɪɴs (ᴄᴀᴛᴇɢᴏʀɪᴇs) ɪɴ ᴀ ғʀᴇǫᴜᴇɴᴄʏ ᴅɪsᴛʀɪʙᴜᴛɪᴏɴ ᴛᴀʙʟᴇ; ɪᴛ's ᴀʟsᴏ ᴛʜᴇ ᴄᴇɴᴛᴇʀ ᴏғ ᴀ ʙᴀʀ ɪɴ ᴀ ʜɪsᴛᴏɢʀᴀᴍ. ɪᴛ ɪs ᴅᴇғɪɴᴇᴅ ᴀs ᴛʜᴇ ᴀᴠᴇʀᴀɢᴇ ᴏғ ᴛʜᴇ ᴜᴘᴘᴇʀ ᴀɴᴅ ʟᴏᴡᴇʀ ᴄʟᴀss ʟɪᴍɪᴛs.
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