To determine the experimental probability of not selecting a diamond, we first need to calculate the total number of draws and the number of draws that were not diamonds.
- Total number of draws: 40 (as stated in the problem).
- Number of diamonds drawn: 7 (as stated in the frequency table).
Now, we can calculate the number of draws that were not diamonds:
\[ \text{Number of not diamonds} = \text{Total draws} - \text{Number of diamonds drawn} = 40 - 7 = 33 \]
Next, we calculate the experimental probability of not selecting a diamond:
\[ P(\text{not diamond}) = \frac{\text{Number of not diamonds}}{\text{Total draws}} = \frac{33}{40} \]
To convert this fraction into a percentage:
\[ P(\text{not diamond}) = \frac{33}{40} \times 100 \]
Calculating this gives:
\[ P(\text{not diamond}) = 0.825 \times 100 = 82.5% \]
Thus, the experimental probability of not selecting a diamond is:
\[ P(\text{not diamond}) = 82.5% \]
The correct answer is P(not diamond) = 82.5%.