This objective test question contains a question type which will only appear in a computer-based exam, but this question provides valuable practice for all students whichever version of the exam they are taking.
The times taken to produce each of the first four batches of a new product were as follows:
Batch number Time taken
1 100 minutes
2 70 minutes
3 59 minutes
4 55 minutes
What was the rate of learning closest to? (1 d.p)