maths homework help PLEASE!?

I have tried really hard with this question, I just cant get it!

there are 15 bags of apples in a market. The mean no. of apples in each bag = 9

This table shows 14 bags:

NO. APPLES..... FREQUENCY 7........................... 2 8 ........................3 9 ...........................3 10 .......................4 11....................... 2

Calculate the no. of apples in the 15th bag!

PLEASE HELP ME D:

I AM REALLY STRUGLLING!

Answers
Let x be the number of apples in the mystery bag. Now how many apples are there altogether? x + 7 + 7 + 8 + 8 + 8 + 9 and so on. This number divided by 15 is equal to 9. So you can construct an equation and solve it to get x. Alternatively you can try adding a bag of 7, then a bag of 8, then a bag of 9 and so on until the mean comes out as exactly 9. Good luck.
ianmoth
30 January 2012
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