Jessica Salas, Managing Director of Salas Products, is reviewing the warranty policy for her company's new model of car batteries. Accelerated life tests were performed on a sample of 100 batteries, and the following relative frequency distribution was compiled. Battery Life Relative Frequency (months) 40-under 50 0.05 50-under 60 0.10 60-under 70 0.25 70-under 80 0.50 80-under 100 0.10 The number of batteries in 60-under 70 interval was Select one: O a. 65 O b. 60 O c. 25 O d. 40The ages of students in a class have been put into the frequency distribution below. Age Number of Students 18 3 19 5 20 28 21 4 What is the modal age of these students? Select one: O a. 19 O b. 21 O C. 18 O d. 20The 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 7 10 Waiting Time (minutes) Approximately walk-in customers waited less than 2 minutes. Select one: O a. 30 O b. 100 O c. 180 O d. 20The ages of students in a class have been put into the frequents.f distribution below. Nu mber of Students What is the standard deviation fer this [pepulatien] set of data? Select one: D a. 0.?33 O b. 1.12 D 1:. 0.494 D d. 1.25 The middle value in an ordered array of numbers is called the Select one: O a. mean O b. mode O c. median O d. coefficient of variationThe most frequently occurring value in a set of data is called the Select one: D a. coefcient of variation C! b. mode C! c. median C! d. mean which of the following is a measure of relative dispersion? Select one: Q a. mean absolute deviation 0 b. interouartile range 0 c. standard deviation 0 d. coefcient of dispersion Consider the following stem and leaf plot: Suppose that a frequency distribution Iwas developed from this, and there were 5 classes {Illunder ED, Zunder 30, etc}. what would the freq ueney be for class Bilunder 40? Select one: Q a. 5 O b. 9 05.3 0:14 Adam Shapiro, Director of Human Resources, is exploring employee absenteeism at Harrison Haulage during the last operating year. A review of all personnel records indicated that absences ranged from zero to twentynine days per employee. The following class intervals were proposed for a freq uenev distribution of absences. [ll-under 5 5-under 11] l-onder 15 lt-under 2i] EDunder 25 25- u rid e r 3:] which of the following represents a problem with this set of intervals? Select one: G a. there are too few intervals 0 b. some numbers between D and 29 would not fall into any interval O c. the rst and second interval ovedap E) El. none of the above {These intervals are okay.) Isobel Robinson, Director of Quality,r Control, is concerned about the variability in a drilling process. 111E process should produce 1 cm holes in aluminum casb'ngs. A sample of ninety castings are drilled and inspected. Data collected from measuring the ninety:r holes was compiled to form the following frequency distribution. Hole Diameter {cm} Number of Holes ELSEunder i] .91] 10 [Leo-under [L95 DES-under 1.0!] LOCI-under 1.05 1.0 Sunder 1.11] The percentage of holes under 1 cm in diameter was Select one: D a. 60% O b. 33% D II. 50% Q d. 6?%
