Solution of problem N836 Laplace probability theory

Solution of problem N836 Laplace probability theory

836. In the advanced scientific laboratory, it was possible to cross potatoes with pineapple. Unfortunately, the seedlings of such a promising plant do not take root well - only one starts from 10. Yunnat from the sponsored circle helps scientists in their outstanding studies. They planted 400 amazing plants. Find the probability that soon the harvest will be: a) exactly 60 of them; b) not less than 60; c) at least 25 plants; d) from 30 to 50 plants.

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Detailed solution. Decorated in Microsoft Word 2003 (Quest decided to use the formula editor)