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Statistics revision

Statistics revision

Given the data set   
 4 , 10 , 7 , 7 , 6 , 9 , 3 , 8 , 9  
Find  
 a) the mode,  
 b) the median,  
 c) the mean,  
 d) the sample standard deviation.  
 e) If we replace the data value 6 in the data set above by 24, will the standard deviation increase, decrease or stay the same?