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                                    The mean and standard deviation of 20 observations are found to be 10 and 2 respectively. On rechecking it was found that an observation 8 was incorrect. Calculate the correct mean and standard deviation when (i) the wrong item is omitted, (ii) the wrong item is replaced by 12. | 
                            
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Answer»  The mean and standard deviation of 20 observations are found to be 10 and 2 respectively. On rechecking it was found that an observation 8 was incorrect. Calculate the correct mean and standard deviation when (i) the wrong item is omitted, (ii) the wrong item is replaced by 12.  | 
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