To calculate the total cost of the pumpkins, we first need to find the total number of pounds purchased. Given the weight range from 6 to 14 pounds, we can sum the amounts:
\[ 6 + 7 + 8 + 9 + 10 + 11 + 12 + 13 + 14 = 70 \text{ pounds} \]
Next, we multiply the total weight by the cost per pound to find the total cost:
\[ \text{Total cost} = 70 \text{ pounds} \times 0.30 \text{ dollars/pound} = 21 \text{ dollars} \]
Now, we subtract the total cost from the amount the baker paid:
\[ \text{Change} = 100 \text{ dollars} - 21 \text{ dollars} = 79 \text{ dollars} \]
Therefore, the change the baker will receive is:
\[ \boxed{79} \]