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Table 2 Readability statistics for Hubble and Machu Picchu texts

From: Mimicry and expressiveness of an ECA in human-agent interaction: familiarity breeds content!

  Hubble Machu Picchu
Number of words 328 250
Average words per sentence 18.2 17.8
Average characters per word 5.0 4.9
Percentage passive sentences 27 % 57 %
Flesh-Kincaid Reading Ease (out of 100, higher score, greater reading ease) 41.0 48.8
Flesch-Kincaid Grade Level (equivalent to US school grade) 12 10.8