Final answer:
The most accurate estimate for the difference between the amounts of reading goal completed is 433 pages.
Step-by-step explanation:
To find the most accurate estimate for the difference between the amounts of reading goal completed by Jordan and Raj, we subtract the number of pages Jordan has completed from the number of pages Raj has completed. So, the difference is 511 - 78 = 433 pages. Therefore, the most accurate estimate for the difference in reading goal completed is 433 pages.