To determine the best estimate for the number of COVID-19 cases in the UK on day 22 using the provided graph, you would typically locate day 22 on the x-axis and see where it intersects with the plot of total cases on the y-axis.
Since I don't have access to the actual image of the graph, I can't provide the exact value. However, you could look for where day 22 falls on the x-axis and read the corresponding y-value.
Given the options you have:
- 30,000 cases
- 25,000 cases
- 3,500 cases
- 21,000 cases
You should be able to see which value is closest to the y-axis value at day 22 on the graph. If the value appears to be closest to 25,000 cases or 21,000 cases, for instance, you would select those accordingly as the best estimate.
Please check the graph and align day 22 with the y-axis to choose the best estimate accordingly.