<p>Help!</p>
<p>The probability of passing a math test for Linda is 80%, the probability of passing a math test for Tom is 75%, and the probability of passing a math test for Alice is 60%. The probability of passing a math test for other seven students is 70%. If a teacher randomly picks two out of these ten students to take a math test, what is the probability that both students will pass the math test (assuming 75% means passing)?</p>
<p>???????????????</p>
<p>you don't really need to do "logs with different bases." Just use change of base.</p>
<p>Puddinggirl is the answer 1/45?</p>
<p>wouldn it be 1/225?</p>
<p>Why 1/125?</p>
<p>i thot it was 1/225 because of she chooses 2 students out of 10 that would be 45. Since only 2 students have 75% or higher 2/10 would pass. So i multiplied (2/10 *1/45) = 1/225</p>
<p>I thought it should be 2/10 x 1/9 (After one of the only 2 people who can pass is taken) you're left with 1 out of a total of 9. That would get me 1/45.</p>
<p>oh wait maybe thats right then</p>
<p>I know that Barron's is considered one of the best books for its hard tests... but I was wondering if its review sections are also good? There are a lot of things I'm not familiar with, but I think if I can get a good book to review with, then I can do well. I looked at the Sparknotes book in the bookstore, and its review sections looked pretty good, but I only skimmed it. I'll still get Barron's for its tests, but I definitely need review.</p>
<p>log(a) / log(b) would mean log base a of b (in both TI 83-84 and TI 89). You can also define your own functions in TI 89.</p>
<p>Rusen Meylani.</p>