Fortune magazine’s list of the world’s most admired companies for is provided the data contained in the DATAfile named AdmiredCompanies (Fortune, March 17, 2014). The data in the column labeled Return shows the one-year total return () for the top-ranked companies. For the same time period the S&P average return was . Click on the datafile logo to reference the data. a. Compute the median return for the top-ranked companies (to 1 decimal). b. What percentage of the top-ranked companies had a one-year return greater than the S&P average return? c. Develop the five-number summary for the data. If required, round your answers to two decimals places. If required, enter negative values as negative numbers. Return Minimum First Quartile Median Third Quartile Maximum d. Are there any outliers? - Select your answer - e. Select a box plot for the one year – total return

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Consider a slotted aloha system, where the time slot equals the fixed duration of each packet. assume that there are 4 stations a,b,c,d sharing the medium. (a) stations a,b,c,d receive one packet each from higher layers at times 1.3, 1.5, 2.6,5.7 respectively. show which transmissions take place when, according to the slottedaloha protocol; describe all transmissions until all four packets have been successful.when needed, each station has access to the following sequence of random number, provided by a random number generator and drawn uniformly between 0 and 1: (1) station a draws numbers: 0.31, 0.27, 0.78, 0.9, 0.9, 0.11, 0. (2) station b draws numbers: 0.45, 0.28, 0.11, 0.83, 0.37, 0.22, 0. (3)station c draws numbers: 0.1, 0.2, 0.3, 0.4, 0. (4) station d draws numbers: 0.36, 0.77, 0.9, 0.1, 0.1, 0.1, 0.1, 0. (b) in slotted aloha, a station transmits in each time slot with a given probability. what probabilities would you assign to each of the four stations so as to: (i) maximize the efficiency of the protocol? (ii) maximize fairness among the four stations? (c) will the efficiency increase or decrease if we modify slotted aloha as follows: (i) get rid of slots and allow stations to transmit immediately? (ii) implement carrier sensing? (iii) implement collision detection? (iv) implement collision avoidance?