The probability that a new pen writes poorly is 0.14. The buyer chooses one pen.

The probability that a new pen writes poorly is 0.14. The buyer chooses one pen. The probability that this pen writes well is 0.14.

Overall probability – 1

The probability that the pen writes poloho is 0.14

The probability that the pen writes well is x

Let’s make the equation:

0.14 + x = 1

x = 1 – 0.14 (We transfer the unknown in one direction, and the known in the other)

x = 0.86

Answer: The probability that the pen writes well is 0.86