# Mean of 20 observation is 17. if 20 is subtracted from the sum of observation, then determine the sum remaining.

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by Shishant

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by Shishant

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No.of observations = 20

Mean = 17

⇒ Sum of observations/No.of observations = 17

⇒ x/20 = 17

⇒ x = 17×20

∴ x = 140

∴ The sum of the observations is 140

If 20 is subtracted from the sum of observations then the remaining

sum = 140 - 20 = 120