21) 7.6

66 – 31= 35% have intake of between 6 and 9 grams per day.If we assume linearity, 19/35 have between 6 and the median.
19/35 = 0.54

3 x 0.54 = 1.62
6 + 1.62 = 7.62
7.62 ≈ 7.6

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