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From the given information,
The range rule of thumb shows that the usual values are within 2 standard deviations from the mean.
Lower limit= mean-(2 standard deviation)=1115.9-(2120.9)=874.1
Upper limit= mean+(2 standard deviation)=1115.9+(2120.9)=1357.7
The limit of values is from 874.1 to 1357.7
A value below 874.1 is considered low and a value above 1357.7 is considered high.
Since the value is 1377.7 is more than the upper limit, it is considered a significantly high value