the mean of 21 observation is 12.5. if an observation 12.5 is deleted , then mean of remaining observation is​

2 thoughts on “the mean of 21 observation is 12.5. if an observation 12.5 is deleted , then mean of remaining observation is​”

1. Answer:

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2. Step-by-step explanation:

   Given:–

   The mean of 21 observation is 12.5 and an observation 12.5 is deleted .

   To find:–

   The mean of remaining observations ?

   Solution:–

   Given number of all observations = 21

   Mean of the 21 observations = 12.5

   Mean = Sum of all observations/Number of all observations

   =>12.5 = Sum of all observations /21

   =>Sum of all observations = 12.5×21 = 262.5

   Sum of 21 observations = 262.5

   Number of deleted observations = 1

   Deleted Observation = 12.5

   Sum of remaining observations = 262.5-12.5

   Sum of remaining observations = 250

   Number of remaining observations = 21-1 = 20

   Mean = Sum of all observations/Number of all observations

   =>Mean = 250/20

   =>Mean = 25/2

   =>Mean = 12.5

   Therefore,Mean = 12.5

   Answer:–

   Mean of the remaining observations = 12.5

   Used formula:–

   • Mean = Sum of all observations/Number of all observations

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