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BADB2013 BUSINESS STATISTICS TUTORIAL 1 1. The data below is about the cost of electricity during July 2011 for a random sample of 40 one- bedroom apartments in a large city a. Construct a frequency distribution for the above data. b. Construct a cumulative frequency distribution. c. Construct a relative frequency distribution. d. Construct a histogram for the relative frequency distribution. e. From (a) above calculate the mean, and standard deviation for the above data. 2. The following data is from a population of n=5. 7 -5 -8 -7 9 a. Compute the mean, median, and mode. b. Compute the range, variance, standard deviation, and coefficient of variation. 3. The operations manager of a plant that manufactures tires wants to compare the actual inner diameters of two grades of tires, each of which is expected to be 575 mm. A sample of tires of each
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Unformatted text preview: grade was selected and the results representing the inner diameters of the tires, ranked from smallest to largest are as follows. a. For each of the two grades of tires, compute the mean and standard deviation. b. For each of the two grades of tires, compute the coefficient variation and compare the result. 4. These data are the times (in minutes) taken to commute from home to work for 20 workers. Construct a stem and leaf plot for the above data. 5. The following table shows the frequency distribution of telephone bills for February 2015 for a sample of 50 families. Amount of Telephone Bill (RM) Number of families 40 – 69 8 70 – 99 10 100 – 129 16 130 -159 11 160 - 190 5 Calculate the mean, variance and standard deviation....
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