(a)

Bars with no gaps, heights matching table frequencies, correct word count intervals on grid.
Result: Correct histogram [3]

(b)
\( 3800 \leq w < 4000 \)
Modal group is the interval with the highest frequency.
Result: \( 3800 \leq w < 4000 \) [1]

(c)
\( \frac{3}{35} \)
Probability formula: \( P(w \geq 4000) = \frac{\text{students with } w \geq 4000}{\text{total students}} \).
Step: \( \frac{3}{35} \approx 0.0857 \) or 8.57%.
Result: \( \frac{3}{35} \) [2]