11 परिणामों का औसत 18 है पहले 5 का औसत 17 है तथा अंतिम पांच का औसत 20 है छठवां परिणाम क्या है
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total 11 number average =119.9
fist 6 number average = 39
last 6 number average = 68.4
answar = 119.9- (39+68.4)= 12.5
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