Ответ:

Olmali bo‘lmagan piroglar ulushi: \(1-\frac{3}{8}=\frac{5}{8}\).

Yong‘oqli piroglar jami piroglarning \(\frac{5}{8}\cdot\frac{2}{5}=\frac{1}{4}\) qismini tashkil etadi.

Shokoladli piroglar ulushi: \(\frac{5}{8}-\frac{1}{4}=\frac{5}{8}-\frac{2}{8}=\frac{3}{8}\).

Javob: \(\frac{3}{8}\).