To determine the experimental probability of not selecting a diamond, we first need to find the total number of draws and the number of draws that resulted in diamonds.
From the table, the frequencies of the suits are:
- Diamonds: 7
- Spades: 11
- Hearts: 9
- Clubs: 13
The total number of draws is: \[ 7 + 11 + 9 + 13 = 40 \]
Next, we find the number of draws that were not diamonds: \[ \text{Total draws} - \text{Number of diamonds} = 40 - 7 = 33 \]
Now we can calculate the experimental probability of not selecting a diamond: \[ P(\text{not diamond}) = \frac{\text{Number of draws not diamonds}}{\text{Total draws}} = \frac{33}{40} \]
To express this as a percentage: \[ P(\text{not diamond}) = \frac{33}{40} \times 100 = 82.5% \]
Therefore, the experimental probability of not selecting a diamond is: \[ \boxed{82.5%} \]