Question

Here is the data indicating the number of plants contributed by different houses:

Number of

plants

contributed

1-3 4-6 7-9 10-12 13-15 16-18

Number of

houses

10 8 x 7 12 4

On the basis of the above information, answer any four of the following questions:

(A) If the mean number of plants contributed be 8.9, then how many houses contributed 7 to 9

plants?
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Answer 1

There are nine houses contributed to 7-9 plants