Originally Posted by

**CrazyAsian** I'm having an issue because I can't connect my teacher's answer with the textbook's question.

"Tritium is the basic fuel of hydrogen bombs and is used to increase the power for fission bombs. Tritium decays at a rate of 5.5 percent a year. This means that Prob[tritium atom dies <= t] follows an exponential distribution with mean = 1/Log(1-0.055)."

It goes on to explain where it got that answer by setting up a separable differential equation and solving for r. However, what doesn't make sense is 1/Log(1-0.055) is equal to -17.6771 which doesn't make sense.

However, the teacher says a decay of 5.5% means the tritium follows the exponential distribution with mean = 1/0.055.

Can anyone help me make sense of this?