紅石ABC

又有條數唔識做, 求高手打救, 謝謝

Louis, a store owner who buys the iron rods from the factory, selects a box of iron rods randomly and checks each iron rod in the box one by one. If more than 3 unacceptable iron rods are found in a box, the whole box of iron rods will be returned to the factory.
One box contains 10 iron rods. The probability that an iron rod is acceptable is 0.92701512.

Given that the box of iron rods will be returned to the factory, find the probability that there are less than 5 unacceptable iron rods in the box.

Ans:0.9083

夏娜醬大好

Let k = 0.92701512

P = (10C4)(k^6)(1-k)^4 / [1-k^10-(10C1)(k^9)(1-k)-(10C2)(k^8)(1-k)^2-(10C3)(k^7)(1-k)^3]

紅石ABC

計到了, 謝謝