3.2
3.3
3.7
4.2
Correct answer is B
Mode = a + (b - a)(fm - Fb)
2Fm - Fa - Fb
= 3.0 + (3.4−3)(15−4)2(15)−4−10
= 3 + (6.4)(11)30−14
= 3 + 4.416
= 3 + 0.275
= 3.275
= 3.3cm
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