If the person enters a gym-club he must pay L.E. 20 and he has to pay L.E. 10 for each

game he plays. From the experience of the owner of the club he found that the distribution

of the number of games played by the players was as follows :

No. of games played

1

2

3

4

5

6

No. of players

7

8

15

9

6

5

Calculate the average payment of any player.