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Mean = 1161.2
Standard deviation = 122.7
The range rule of thumb indicates that the usual values are within 2 standard deviation from the mean.
Hence lower limit = Mean - 2 x Standard deviation
=1161.2 - 2x122.7
=1161.2 - 245.4
Upper Limit = Mean + 2 x Standard deviation
=1161.2 + 2x122.7
=1161.2 + 245.4
The limit of values is from 915.8 to 1406.6
A value below 915.8 is considered low and a value above 1406.6 is considered high
1446.6 is more than the upper limit. Thus it is high for a brain.