Consider the following frequency distribution: Class Interval Frequency 100-under 200 25 200-under 300 45 300-under 400 30 What is the relative frequency of the second class interval? Select one: O a. 0.33 O b. 0.45 O c. 0.30 O d. 0.70 The cumulative frequency for a class is 27. The cumulative frequency for the next (non-empty) class will be Select one: O a. greater than 27 O b. less than 27 O c. 27 minus the next class frequency O d. equal to 27The staff of Tom Wilson, Operations Manager at Port Pirie Building Society, prepared a frequency histogram of waiting time for walk-in customers. 100 90 Number of Customers 2 3 4 5 6 7 8 10 Waiting Time (minutes) Approximately walk-in customers waited at least 7 minutes. Select one: O a. 100 O b. 30 O C. 180 O d. 20Michael Bayley, Marketing Director of Plain Power Plant's Electrical Division, is leading a study to assess the relative importance of product features. Two items on a survey questionnaire distributed to 100 of Plain's customers asked them to rate the importance of 'ease of maintenance' and 'efficiency of operation' on a scale of 1 to 10 (with 1 meaning 'not important' and 10 meaning 'highly important"). His staff assembled the following statistics on these two items. Ease of Efficiency of Maintenance Operation Mean 7.5 6.0 Median 8.5 5.5 Mode 9.0 4.5 Standard 1.5 2.5 Deviation What can Michael conclude from these statistics? Select one: O a. the Ease of Maintenance distribution has more relative dispersion O b. the Efficiency of Operation distribution has less dispersion O c. the Ease of Maintenance distribution has less dispersion O d. the Efficiency of Operation distribution is skewed to the leftConsider the following 3 numbers: ll], 20, 30. In calculating measures of central tendency and variability for this set of data, which of the following is true? Select one: D a. you can calculate the mode only if you ltnoy.I if this is a sample or a population 0 b. you can calculate the median only if you know if this is a sample or a population 0 c. you can calculate the mean only if you know if this is a sample or a population 0 d. you can calculate the variance only if you know if this is a sample or a population A statistics student made the following grades on 5 tests: 84, 7'8, 88, F8 and F2. What is the mean grade? Selectone'. Q a. 84 O b. 78 D c. 7'2 0 d. St] A sales manager has sampled past sales records to determine hoe.I manyr televisions are sold each day. Dailyr records for a sample of 5 days have been selected. The sales on these days are: 2, 4, 5, 2, 7". what is the standard deviation for this set of sample data? Selectone: O a. 0 D b. 2.12 O c. 2 D d. 4.5 Consider the following stem and lea':r plot: Suppose that a frequency distribution Ialas developed from thisr and there were 5 classes {launder 20, Zunder 30, etc.}. Il'll'hat was the lowest number in the data set? Select one: Q a. 0 O b. 2 CI 1:. ll] 0 d. F" The total frequency of the data whose histogram is shown below is approximately: 12 10 8 ONAO 6 8 10 12 14 16 18 Select one: O a. 50 O b. 11 O c. 100 O d. 72The following freouencv distribution I.vas constructed for the age of accounts receivable. The frequencv distribution reveals that the accounts receivable ages are Select one: D a. normally:r distributed D b. skewed to the right D c. skewed to the left 0 d. not skewed