Answers

2015-12-25T13:23:13+05:30
Mean =20
no. of observations = 17
sum = 340
340-25=315
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2015-12-25T16:14:35+05:30
Let the sum of observations be x
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

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