The mean of 7 observation is 30 . including one new observation,the mean remains 30. find the newly included observation
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Mean of 7 observations = 30
Sum of the 7 observations = Mean x No. of observations
30 x 7 = 210
Let new observation be ‘x’
New mean = 210 + x / 8 (∵ 8 is the number of observations including new observation)
30 = 210 + x / 8
30 x 8 = 210 + x
240 = 210 + x
x = 240 - 210
x = 30
Hope this helps! :)
Sum of the 7 observations = Mean x No. of observations
30 x 7 = 210
Let new observation be ‘x’
New mean = 210 + x / 8 (∵ 8 is the number of observations including new observation)
30 = 210 + x / 8
30 x 8 = 210 + x
240 = 210 + x
x = 240 - 210
x = 30
Hope this helps! :)
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