#69 Fix the sum and avg function for the only numeric value.

[spyzhov]

Closes #69

[codecov-commenter]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 86.78%. Comparing base (a3c0a6b) to head (04891a5).

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Additional details and impacted files

@@            Coverage Diff             @@
##           master      #70      +/-   ##
==========================================
+ Coverage   86.73%   86.78%   +0.05%     
==========================================
  Files          11       11              
  Lines        3084     3096      +12     
==========================================
+ Hits         2675     2687      +12     
  Misses        326      326              
  Partials       83       83              

Flag	Coverage Δ
unittests	86.78% <100.00%> (+0.05%)	⬆️

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