<p>I have a question.</p>
<p>Suppose that of a sample of 400 registered votes, 256 said they were undecided 1 month prior to an election. What is the probably that between 60% and 68% of the electorate were undecided at that time?</p>
<p>i got 90.414 percent</p>
<p>I don't think the stats exam is that easy. It's been several years since I took it but I found parts of it sort of challenging. And I was the only person in my school in my year or the previous one to get a 5.</p>
<p>Can you explain timeless?</p>
<p>i'm currently in precalc and ap stats and manage to pass with a 97% in both. at my school it's just pretty much how much time you put into the class. honestly, i think ap stats is a lot easier than precalc, but probably because stats is a lot of vocab and calculator work. i hope the stats exam is as easy as i hear because the practice tests my class has been doing are a little hard. but yeah, i wouldn't say the class overall is a joke. it is quite easy, yes, but it depends what kind of student you are and the teacher you have.</p>
<p>Ok, well its a zscore n>30, so sigma= sqrt(p(1-p)) where p = 226/400. so your area up to 68% you do as normCdf(lower, upper, mean, standard dev) and standard deviation = sigma / sqrt(n = 400),
so normCdf(.60, .68, 226/400, sigma/sqrt(400))</p>