Question

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

Answer 1

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

Answer 2

Answer:

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