The number of enrors ,X, on each of 200 paqes of typescript was Monitored. The results when summarized showed that 82=905 Ex²=4932 %3D ) Calculate the mean and Standard deviatian of the number of errors per page- ) There is a correction for the data. One of the data, 7.9, is Considered as an mean and Stand ard deviation for the data after the corrections. outlier and removed. Find the

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