That's from (38 - 36)/2 = 1 standard deviation below the mean to (43 - 38)/2 = 5/2 or 2.5 SD above so look those up in the chart then subtract:
2.5 above: 0.9938
1 below: 0.1587
------------------------
0.8351
5/8
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That's from (38 - 36)/2 = 1 standard deviation below the mean to (43 - 38)/2 = 5/2 or 2.5 SD above so look those up in the chart then subtract:
2.5 above: 0.9938
1 below: 0.1587
------------------------
0.8351
5/8