There are 120 tagged birds total, and 45 of them are hawks. The probability that the first bird selected is a hawk is $\frac{45}{120}=\frac{3}{8}$. Because the first bird is not replaced, there are now 119 birds left, and 44 of them are hawks. So the probability that the second bird is also a hawk is $\frac{44}{119}$. Multiply the probabilities:

Therefore, the probability that both selected birds are hawks is $\frac{33}{238}$.

To get two marbles of different colors, there are two possible orders: red then blue, or blue then red.

The probability of drawing a red marble first and then a blue marble is

The probability of drawing a blue marble first and then a red marble is

These two probabilities are equal, so the total probability is

Therefore, the equivalent expression is $2\left(\frac{5}{12}\cdot \frac{7}{11}\right)$.

The question asks for the experimental probability that it rained, given that the predicted chance of rain was from 60% through 79%. That means we look only at the 40 days in that $x$-value range. Of those 40 days, 28 have $y=1$, meaning it actually rained. So the experimental probability is $\frac{28}{40}=\frac{7}{10}=0.70$. Therefore, the value closest to the experimental probability is $0.70$.

To find the probability that the two marbles are different colors, it is often easier to first find the probability that they are the same color and subtract from 1.

There are 9 marbles total, so the total number of ways to draw 2 marbles is

Now count the same-color pairs:
- Red-red:

- Blue-blue:

- Green-green:

So the number of same-color pairs is

Thus, the probability of drawing 2 marbles of the same color is

Therefore, the probability of drawing 2 marbles of different colors is

Since

the statement that must be true is that the probability is greater than $\frac{1}{2}$.

The probability is the fraction of the garden's area that is watered. Since the watered region is a sector of the circle, its area is proportional to its central angle. So the probability is $\frac{108}{360}=\frac{3}{10}$. Therefore, the correct answer is $\frac{3}{10}$.