1. The mean of 7,5,13,x,15,17 is 15 , then value of x is ?
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ꜱᴜᴍ ᴏꜰ ᴀʟʟ ɴᴜᴍʙᴇʀ / ɴᴜᴍʙᴇʀ ᴏꜰ ᴏᴜᴛᴄᴏᴍᴇꜱ = ᴍᴇᴀɴ
ᴛʜᴇɴ,
7+5+13+15+17+x/6=15
67 +x = 15×6
x = 90/67
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