k. Which data point has the second maximal mean kriging variance?(0.5 mark)

I'm sorry, but you didn't provide the data or the context needed to answer this question. The mean kriging variance is a concept used in geostatistics and spatial statistics, and it refers to the average variance of the predicted values from a kriging model. To find the data point with the second maximal mean kriging variance, you would need to:

1. Fit a kriging model to your data.
2. Calculate the predicted values and their variances.
3. Sort the data points by their variances.
4. Identify the data point with the second highest variance.

Without the specific data or the kriging model, it's impossible to provide a more specific answer.