The mean of five numbers is $30$ . If one number is added then the mean becomes $34$ . The extra added number is

44

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54

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34

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64

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Solution

The correct option is A $54$
The $m e a n$ of $5$ numbers is $30$
The $t o t a l$ of $5$ numbers is $5 \times 30 = 150$
The $m e a n$ of $6$ numbers is $34$
The $t o t a l$ of $6$ numbers is $34 \times 6 = 204$
The added extra number is $204 - 150 = 54$

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