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Google scholar has a full-text index of nearly all research papers. You can use it to get counts for arbitrary phrases. I've been using this to measure popularity of things in science. For example, here's the popularity of Greek letters used in equations 1/3

Here's one measuring the frequency of sample sizes. Like how often people use 8 samples vs 12 samples for reporting research results. N=2 is apparently the most popular 2/3

2 is not a large enough sample size, and 10 is barely large enough. Perhaps your count captured a phrase like: '2 samples out of the 500 exhibited....'