Problem-Solving and Data Analysis: One-variable data-Distributions and measures of center and spread — Quiz 2

Questions in this quiz (10)

1. For quality control, a company that manufactures lightbulbs conducted five different trials. In each trial, $$500$$ different lightbulbs were tested. The bar graph shows the number of defective lightbulbs found in each trial:What is the mean number of defective lightbulbs for the five trials?

   • $$4.0$$
   • $$4.2$$
   • $$4.6$$
   • $$5.0$$

2. The table shows the number of items produced in each period:What is the range of the number of items produced?

   • $$6$$
   • $$7$$
   • $$8$$
   • $$9$$

3. The number of days a machine produced certain outputs over $$12$$ days is shown below.$$5$$ units for $$3$$ days,$$7$$ units for $$2$$ days,$$9$$ units for $$4$$ days,$$12$$ units for $$3$$ days.For how many days did the machine produce at least $$9$$ units?

   • $$3$$
   • $$4$$
   • $$7$$
   • $$9$$

4. Data set A: $$10,12,14,16,18$$Data set B: $$8,11,13,17,x$$If the mean of both data sets is the same, what is the value of $$x$$?

   • $$15$$
   • $$16$$
   • $$17$$
   • $$21$$

5. Data set $$X$$: $$6,8,10,12$$Data set $$Y$$: $$6,8,10,12,20$$Which statement is correct?

   • $$The\ mean\ of\ X\ is\ greater\ than\ the\ mean\ of\ Y$$
   • $$The\ mean\ of\ X\ is\ less\ than\ the\ mean\ of\ Y$$
   • $$The\ means\ are\ equal$$
   • $$Cannot\ be\ determined$$

6. A list of $$8$$ numbers is shown:$$5,9,12,7,11,6,10,8$$What is the mean of these numbers?

   • 8.5

7. Each value represents the number of minutes students studied:$$20,35,40,25,30,50,45,25$$What is the mean number of minutes?

8. The data set is:$$3,5,7,7,9,11,13$$Which list has the same median?

   • $$5,7,7,9,11$$
   • $$3,5,7,9,13$$
   • $$7,7,9,11,13$$
   • $$5,7,9,11,13$$

9. The table shows daily sales:What is the mean number of sales?

   • $$130$$
   • $$140$$
   • $$150$$
   • $$160$$

10. The table shows values for two schools over five years.Which statements are true?$$I$$. The mean of School A is greater than the mean of School B.$$II$$. The median of School A is greater than the median of School B.

    • $$I\ only$$
    • $$II\ only$$
    • $$I\ and\ II$$
    • $$Neither\ I\ nor\ II$$