The number of emors ,X, On each of 200 of typescript was Monitored. The results when summarized showe d that pages 8x= 905 Ex²=4932 %3D %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 outlier and removed. Find the and stand ard deviation for the date after the corrections. to considered as an mean A further 50 pages were Monitored and it was found that the mean was 4.8 erors and standord deviation was l.95 erors . ) Calcolate the mean and stand ard devirtion of the number of emors per page for the 249 pages.

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