9
8
10
7
Correct answer is D
Mode = L1 + (D1D1+D2)C
D1 = frequency of modal class - frequency of the class before it
D1 = 5 - 2 = 3
D2 = frequency of modal class - frequency of the class that offers it
D2 = 5 - 3 = 2
L1 = lower class boundary of the modal class
L1 = 5 - 5
C is the class width = 8 - 5.5 = 3
Mode = L1 + (D1D1+D2)C
= 5.5 + 32+3C
= 5.5 + 35 x 3
= 5.5 + 95
= 5.5 + 1.8
= 7.3 ≈ = 7
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