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Unformatted text preview: QUIZ 1 (CHAPTERS 14) SOLUTIONS MATH 119 SPRING 2011 KUNIYUKI 105 POINTS TOTAL, BUT 100 POINTS = 100% Show all work, simplify as appropriate, and use good form and procedure (as in class). Box in your final answers! No notes or books allowed. A scientific calculator is allowed. 1) (4 points). The prices of new cars at a car dealership are recorded. A frequency table for all of those prices is given below. Fill out the relative frequency column. Write out the entries as decimals rounded off to three decimal places. Car price Frequency Relative Frequency Under $15,000 8 8 42 0.190 $15,000  $24,999 15 15 42 0.357 $25,000  $34,999 13 13 42 0.310 $35,000 and Over 6 6 42 0.143 The number of prices is: 8 + 15 + 13 + 6 = 42. 2) (8 points). The numbers of students enrolled in 15 classes at Colbert College are given below. Do a stemandleaf plot of the 15 enrollment numbers, which are as follows: 41 34 33 40 21 51 47 26 60 58 45 26 55 52 37 Stage 1: Attach leaves to stems. Stage 2: Sort leaves for each stem. 2 166 2 166 3 437 3 347 4 1075 4 0157 5 1852 5 1258 6 0 6 0 3) (33 points total). A judge at a talent competition gives the following scores (in points) for five singers: Singer Score (in points) Christina 68 Gaga 81 Justin 68 Katy 84 Simon 74 a) (4 points). Find the mean of these scores. Show work! 68 + 81 + 68 + 84 + 74 5 = 375 5 = 75.0 points b) (4 points). Find the median score. First, sort the numbers in, say, ascending order. 68 68 74 81 84 The number in the middle is 74. Answer: 74.0 points c) (4 points). Find the mode of these scores. The most common score is: 68 points d) (4 points). Find the midrange of these scores. Min+ Max 2 = 68 + 84 2 = 76.0 points e) (4 points). Find the range of these scores. Max Min = 84 68 = 16.0 points f) (13 points). Find the standard deviation of these scores. Treat the data set as a population data set, not a sample data set. Round off your answer to the nearest tenth of a point; do not round off elsewhere. Show all work! From a), we know that the population mean is 75.0 points; i.e., = 75.0 points....
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 Spring '11
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 Math, Statistics

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