The arithmetic mean of 8 observations was found to be 12.5, then the sum of the observations is ___

a)100

b)120

c)130

d)140

a)100

b)

The arithmetic mean of 8 observations was found to be 12.5, then the sum of the observations is ___

a)100

b)120

c)130

d)140

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Solution:–Arithmetic Mean of Observations = 12.5

Number of Observations = 8

✯ Arithmetic Mean = Sum of Observations÷Number of Observations

✯ Sum of Observations = Mean×Number of Observations

→ 12.5×8

→ 100

Sum of Observations =

Optiona.100[tex]\Large{✓}[/tex]

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