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Sticky Note
Arithmetic mean is 25 and all sum of observations is 350 then number of observations are
  1. 14
  2. 24
  3. 15
  4. 16
Explanation

Given:

mean=25

the sum of all observations= 350

To find:

number of observations

Solution:

The formula for mean

Mean = sum of all observations 

            number of observations

Putting all the values

25= 350/number of observations

number of observations= 350/25

∴ number of observations=  14

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