My working out:
Z = (14-9.5)/2.25 = 2
% less than 2 = 95%
Answer is 97.5 % .... no idea...
2026-03-31 20:52:12.1774990332
Standard Deviation for Normally Distributed Bell Curve - Worded Problem
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Using the 68/95/99.7 rule, 14 degrees is 2 standard deviations away from the mean.
50% left half + (1/2 of 95% (mean to 2$\sigma$)) and you get 97.5%.