<p>what did everyone get for the standard deviation/ mean one. 0 ?</p>
<p>Hey guys, so I’m seeing a lot of questions here and I thought I’d compile the most trending ones of them in a single list for us to refer to rather than the sequential order in the actual test. If you have thoughts on any of these just refer to the question by it’s letter here in this post and let us know what you think!</p>
<p>A: Question 50. I’m surprised this was the last one. The question gives you three sides of a triangle and asks you to find the degree measure of the largest angle. This is a direct implementation of the law of cosines. The largest angle is opposite to the longest side. So it was something like 6^2 = 4^2+5^-2<em>4</em>5*cos(big_angle).</p>
<p>B: Hat tricks. The question tells you that three marbles are place into a hat and then take out “one at a time”. You’re asked to find the probability of getting a certain order of marbles. I first calculated all the possible orders which should be 3! and then there is only one way you can get the outcome that the questions wants so thats a probability of 1/6.</p>
<p>C: The tomb of the “unknown function”. You are told that a function f(x) is symmetric with respect to x=3, and that f(-1) = -1. You are then asked to find f(-7). I was a little confused by this. Ultimately, I gave into Joe Blogg and said -7 so I wont be surprised if I’m wrong. I have no reason to think either way. </p>
<p>D: Committees to form committees. This is a classic combinations question. You are told that there are 11 people out of which a committee of 3 is to be formed. You are asked to find the total possible ways by which this can be accomplished. It should be 11 C 3 = 11!/(3!*8!)</p>
<p>E: First Ebola, now this: The question tells you that the population growth of a bacteria colony can be modeled by 1000e^(sin2t), where T is measured in months. You are told that each interval of “1” represents a month such that Jan is represented by 0 <= x =< 1, Feb by 1 <= x =< 2, and so on. The question then asks you to find during which months would the population be at its maximum size. Graphing the equation (I skipped the 1000), shows that this happens every (pi/4) or February and August. </p>
<p>F: Two’s company, three’s a crowd. Six is…? This question asks for the number of even integers between 1 and 99 that are also multiples of 3. Essentially this questions is asking how many numbers between 1 - 99 are multiples of six. There are (99/2 = 49) multiples of 2 between 2-99 and (99/6 ~ 16) multiples of 6 in the same range. So the answer I believe is 16/49.</p>
<p>G: Big Data. This question tells you that a very large number, say 1000000 is added to a list of very small numbers, say {1,2,3,4,5}. You are asked to indicate which statistical measure would change the least. If you go with the mentioned suggestions for the data sets, adding 1000000 to a list of 1,2,3,4,5 will: definitely increase the maximum from 5 to 1000000; definitely increase the range from 4 to 999999; definitely increase the mean from 3 to 166666; definitely change the SD (the mean changed so the SD will too); but the median - previously 3 - will only go up to 3.5.</p>
<p>F: Greek Life. You are told that sin(phi) = sin(theta), and that cos(phi) = -cos(theta). You are then asked to indicate which choice expresses possible values for 90 >= theta => 0. Just plug in your answers into your calculator if you have one and it should give you the right answer. I can’t remember what the answer was. </p>
<p>G: Parallelelelelelelellllll: You are told that a line is perpendicular to a plane and then asked to indicate how many lines must it be parallel to. This question bugged me. I honestly didn’t spend much time figuring out the exact precise definition of perpendicular. For some reason I thought that for two lines to be perpendicular they must lie in two intersecting planes. I ended up answering one, and I’m no longer confident of this answer. In retrospect, I’m guessing that it’s “infinitely many”. </p>
<p>The Matrix: No clue. Where’s the Oracle? Neo? Anyone></p>
<p>The Rest:</p>
<p>I: Candel question. It’s a inverse square relationship. One variable increases by a factor of 4 so the other decreases by a factor of (1/2)</p>
<p>J: Population growth from 5.7 to 5 million @ rate of 1.015 per year. I got 2. 5.7*(1.015)^2 = 6+ million</p>
<p>K: Slope of points A and B on a square root function is 0.2</p>
<p>L: The ellipse question: A^2 = 4 and b^2 = 16/3 so A = 2 and B= sqrt(4) / 3</p>
<p>M: The rectangle with two given midpoints on two different sides. I can’t remember if the question wanted the diagonal or if it wanted the distance between the midpoints. If it wanted the former, then it’s 10, if it wanted the latter then it’s 5.</p>
<p>N: The textbook question about the norm referenced graph. The answer is 0 since the line of symmetry essentially is the line x=x’ aka the mean. </p>
<p>I did</p>
<p>good. I also got 2 on J, but everyone is saying its 6. Are you sure your right, @rafaelesf because i wasnt sure</p>
<p>Actually, lol, now that I think of it, the answer should be at least 3.4, so if “4 or 5” were not options, then the answer would be 6. I’m doing the same thing I did before, only now I’m getting a different result. Not sure what I did wrong during the test. Bummerrrr</p>
<p>4 was an option</p>
<p>Shouldn’t the answer to the sin (2A) question be asec? You’re supposed to use the double angle formula </p>
<p>@SameerHussain are you sure?</p>
<p>@MyRealName you’re right. sin2x = 2sinxcosx = a
so 2sinx = a/cosx = asecx </p>
<p>@SameerHussain @ivyscores10. it turns out the calculation i did during the exam is still saved on my calculator. i entered 5.7^(1.015) vs 5.7*(1.07)^2. Not sure how I did that but I did. boohoo :/</p>
<p>does anyone know if the question about the midpoints of the sides of rectangle ABCD wanted the length of the diagonal of the rectangle or the distance between the two midpoints?</p>
<p>The length of the diagonal</p>
<p>ugh, how did the misread that</p>
<p>wait what i thought the rectangle question wanted the perimeter of the rectangle ABCD wat how did I misread this D:</p>
<p>also im surprised we are allowed to discuss the test here… i thought it would be banned or something lol</p>
<p>Ugh I hate making those dumb mistakes… I got January and July because I didn’t realize Jan is represented by 0 < x <= 1, I thought it was 1 < x <=2</p>
<p>Also the population growth one was 4. It’s very simple, just do 5.7 * 1.015 then do ans * 1.015 for 4 total times in your calculator to verify lol.</p>
<p>For the 1-99, 2’s and 3’s question. The answer was 1/3. It was asking how many of the two’s were also a multiple of three. 1 out of every 3 two’s is a multiple of three as well. Am I wrong?</p>
<p>Isn’t the answer (X + Y)/2 = N^2 ?</p>
<p>I think for the matrix question I did the determinant and I found that it was 0. I’m not sure if this was at all how to approach the question. </p>
<p>Any predictions for the curve?</p>
<p>I’m guessing R = 43 translates to 800 on this one. It wasn’t the hardest set of questions I’ve seen but it was a time consuming test. The impression I got from my friends is that the quicker alternative solutions were harder to think of on the spot.</p>