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A frequency table has a total frequency of 40. The frequencies of its four values are 9, 12, 7 and $x$ . Find $x$ .

Class 7Frequency Tables and Tally MarksData Handling

A12
B13
C10
D28

Step-by-Step Solution

9 + 12 + 7 + x = 40

, so

28 + x = 40

and

x = 12

. (28 is the sum of the known values, not

x .

)

Answer: A) 12

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