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The arithemetic mean of the following data is 25 ,find the value of k x : 5 15 25 35 45 f : 3 k 3 6 2

Posted by Deepika Agnihotri 4 years, 8 months ago

CBSE > Class 10 > Mathematics

1 answers

Saniya Khanam 4 years, 8 months ago

Arithmetic Mean = ∑f i ∑xi f i ⇒ arithmetic mean = 3+k+3+6+2 (5×3)+(15×k)+(25×3)+(35×6)+(45×2) ⇒arithmetic mean = 3+k+3+6+2 15+15k+75+210+90 =25 ⇒350+25k=390+15k ⇒k=4

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