Figured the easiest way to show you how to do this problem is to use a graphing calculator. Because all you need to do is plug in the value they ask uh into t let's forget that. And for tea. Um So when you see Holy cow, I did not expect that to happen. Uh Okay, I'm just gonna keep happening, isn't it? Okay. So what I need to do is just show you how you can do this um with a couple different things. So first of all, just type in the equation and you can use Y equals, that's not a big deal. Uh one minus E to the negative. Okay, Okay. The flu threat key over three. And uh I'm not too concerned about the graph, but it should make sense as to zero being a probability of zero because it's impossible to have the probability happen immediately, like at zero minutes sometime has to elapse after you hang up whether it's a second or something like that. Um So what you can actually do is just create a table And make the values what you want. So the first value they ask for is one half. So that probability would be .154. The next probability they asked for is I think it was one minute, wasn't it? 02 minutes, two minutes. About .487. Next value they ask for is five minutes, hopes keep messing up. So at five minutes It's about .811. And they actually don't care about these other values. So let me delete them. Uh and you can see the correct answers here here and here for part a part B and part c. And what you could actually, I hope this answer makes sense because if you were to try Um typing in y equals one or that would be a guarantee. Well, there's, if you look closely there's no guarantee because that's a horizontal assent to it. So there's no guarantee that after 15 minutes a call will come in because that would be a probability probability of one is a guaranteed occurrence, but it's very very likely to happen. You know, you have a .99% Okay. Yeah, 99% probability I said that wrong. I don't know what I was thinking. Uh so anyway, using your graphing calculators, all you need to know how to do just plug in values for tea. Mhm, mm. Okay. Yeah.