Assuming a normal distribution, Pr { X < -1.33 } ~= 0.091759135650280765
or about 9.18 %
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I believe the standard deviations are measured from the median, not the mean.1 Standard Deviation is 34% each side of median, so that is 68% total.2 Standard Deviations is 48% each side of median, so that is 96% total.
95%
99.7% of scores fall within -3 and plus 3 standard deviations around the mean in a normal distribution.
The sum of standard deviations from the mean is the error.
95% is within 2 standard deviations of the mean.