To find how many times higher the number of library visits before examination day is compared to the average week, we can use the following formula:
\[ \text{Ratio} = \frac{\text{Number of visits before examination}}{\text{Number of average visits}} \]
Given:
- Number of visits before examination day: \( 2 \times 10^3 = 2000 \)
- Number of average visits: \( 5 \times 10^2 = 500 \)
Now we can calculate the ratio:
\[ \text{Ratio} = \frac{2000}{500} = 4 \]
Thus, the number of library visits before examination day is approximately 4 times higher than the number of visits in an average week.