Defects occur at random in planks of wood with an average of 0.5 per 10 cm length. Office building buys a plank of length 100 cm. I. Find the probability that the office's plank contains at most 3 defects. II. The office buys 6 planks each of length 100 cm, find the probability that fewer than 2 of office's planks contain at most 4 defects.

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