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MATH 3670 Midterm: MATH 3670 GT sol2p Spring10

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turquoisegnu128

15 Feb 2019

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1) the following numbers xi, i = 1, . , 18, represent a sample of size n = 18 from a given population. 2. 1987 2. 5252 2. 8462 2. 2722 2. 2026 2. 0153: compute the sample median and fourth spread and nd eventual outliers. X = (2. 3529 + 2. 4186)/2 = 2. 3858 lf = 2. 1988 uf = 2. 6038 f s = 2. 6038 2. 1988 = 0. 4050. Since uf + 1. 5 f s = 3. 2113 and lf 1. 5 f s = 1. 59130 we have that 1. 5104 and. 18 (cid:19) = 0. 2263: draw a box plot of the data. 1: the number of cars that arrive at a control station every day is described by a random x! e 10. V (x) = 10: find the probability that exactly n cars arrive and exactly n of these cars need service. P (n cars arrive & n cars need service) = P (n cars arrive)p (n cars need service |n cars arrive)

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ey table is seen below xeecions tor Chapter 1 12, Fori, b â¬ Î.el * b-aa (0 (D 14 ForVEQ r the operation defined in Example 1 on the wr John Sue Henry. P iDFor 15ine if is ass ociative by determining if the final six engu defined ang property (ii)of Theorem 1 . So no element i if the operntion debined in Example 1 of Emle if each element has an inverse Section 1.3 Groups iw comutatityn ild Chapter 3 where the Funda the exercises that follow etermining why they are not Write out the Cayley table for the gru(o)nud lensify thee element the 10 elements of the group Z 18 its operation uses ts in the first coordinnte and +2 in the secotu Ldessity the Zn and write out the Cayley table. Reeall th of each element does Theorem 1.14 tell us aont the entries in the Cayley table ol s xrewp that is set with exactly one element. A {n), will always form group since there 19. What nly one way to define an operation on the set. Be sure to shhow that the properi combination of the usual notice what set the rule is be of a group all hold. 21. We can create even create groupe with games! Consider four cups placed in a ssare patter table. If we have a penny in one of the cups there are four ways we can move it to t cup: Horizontally, Vertically, Diagonally, or Stay nehere it is. We will p, S. To define nn operation, consider two movements in a row, v.e.,m ove the penny as r tells us to, then after that move the penny as y instruets. the set of integers the set of real numbers n the set of positive integers. e set of positive integers. n the set of positive integers. on the set of integers e set of negative integers. we ple, HV D since if we first move it horizontally and then vertically nltogether e moved it diagonally. Create the Cayley table for this group, identify the identity and the inverse of cach element 22. Prove that the set A 0 under matrix multiplication. Is it abelian? 23. Verify that 3(R) is a group using the addition of funetions as defined in Example 13 e set of nonzero rational n he set of nonzero real num n on the set R (-1 Section 1.4 Basic Algebra in Groups 24. Prove the Cancellation Law (Theorem 1.20). Do not use any theorems that occur after it in the text ssociative, commutative, has roof or counterexample fo 25. Assume G is a group and a e G. Consider a fixed integer k and use PMI (Theorem 0.3) to prove that for all nEN, a aYou will need to consider cases here since k can be positive, negative, or o 26. Prove Theorem 1.23 (ii) for the case of n > 0 and m