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Severity: Notice

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Backtrace:

File: /home/noqkocv1izd6/public_html/application/views/question.php
Line: 192
Function: _error_handler

File: /home/noqkocv1izd6/public_html/application/controllers/Questions.php
Line: 416
Function: view

File: /home/noqkocv1izd6/public_html/index.php
Line: 315
Function: require_once

What is a reasonable explanation for the gap between the group of people with heights between 43 in. and 55 in., and the group of people with heights between 57 in. and 77 in. according to the graph below?