S(t) = 200[1-(0.86)^t]

Use 10 for t, I get (0.86^10) = 0.2213. Unfortunately it makes no sense in the problem.

Another site has the (0.86^10) = 0.7396

How did they get 0.7396? This does make sense in the question. Thank you.

Question

S(t) = 200[1-(0.86)^t]

Use 10 for t, I get (0.86^10) = 0.2213.  Unfortunately it makes no sense in the problem.

Another site has the (0.86^10) = 0.7396

How did they get 0.7396?  This does make sense in the question.  Thank you.

anonymous · Answer

What is your problem?

anonymous · Answer

It's supposed to predict typing speed.  It makes no sense to be able to type at 155 wpm after 10 hours of practice, but it does make sense to be able to type at 52 wpm.  I think this is what you are asking.