Question

which of the following is the best estimate for the weight of a blue jay 6 days after hatching? (chart: x-axis days after hatching (2–20), y-axis weight (grams) (10–100), scatter plot with points.)

Explanation:

Step1: Analyze the trend

The scatter plot shows the weight (in grams) of a blue jay over days after hatching. We can observe the trend of weight increasing with days. At day 4, the weight is around 20 grams, at day 8, it's around 40 grams. So the weight is increasing approximately linearly (or with a positive trend) between day 4 and day 8.

Step2: Estimate for day 6

Since day 6 is the midpoint between day 4 and day 8, we can estimate the weight at day 6 by taking the midpoint of the weights at day 4 (20 grams) and day 8 (40 grams). The midpoint formula is $\frac{20 + 40}{2}= 30$ grams. Alternatively, by looking at the trend, the weight at day 2 is around 10 - 15 grams, day 4 is 20 grams, day 8 is 40 grams. The increase from day 4 to day 8 is 20 grams over 4 days, so 5 grams per day. From day 4 (20 grams) to day 6 is 2 days, so 20+2*5 = 30 grams.

Answer:

The best estimate for the weight of a blue jay 6 days after hatching is 30 grams (or a value around 30 grams, depending on the exact trend interpretation, but 30 grams is a reasonable estimate).