A survey was conducted on a sample of 1,000 p | vedclass

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Question

(B) Total number of persons surveyed = $1,000$.From the Venn diagram,the number of persons who know at least one language is the sum of all the values

Vedclass · Accepted Answer

$1 / 25$

Vedclass · Answer

(B) Total number of persons surveyed = $1,000$.From the Venn diagram,the number of persons who know at least one language is the sum of all the values inside the circles:Sum = $170 + 180 + 200 + 105 + 85 + 78 + 175 = 993$.The number of persons who do not know any of the three languages = Total persons - Sum of persons who know at least one language = $1,000 - 993 = 7$.The number of persons who know all three languages is the central intersection value = $175$.The required ratio = (Persons who do not know any language) / (Persons who know all three languages) = $7 / 175$.Simplifying the fraction: $7 / 175 = 1 / 25$.

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