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A survey conducted on 20 households in a...

A survey conducted on 20 households in a locality by a group of students resulted in the following frequency table for the umber of family members in a household :
`{:(" Family size ",1 - 3,3-5,5-7,7-9,9-11),(" Number of families "," "7," "8," "2," "2," "1):}`
Find the mode of this data.

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The correct Answer is:
`3 . 286`
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