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# Ch3.WS - PracticeQuestions TheAverageandthe...

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Practice Questions The Average and the  Standard Deviation

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#1 • A list has 10 entries. Each entry  is either 1 or 2 or 3. What must  the list be if the average is 1?  If the average is 3? Can the  average be 4? • Which of the following two lists  has a bigger average? Or are they  the same? (try to answer without  doing any arithmetic)  (i) 10, 7, 8, 3, 5, 9 (ii) 10, 7, 8, 3, 5, 9, 11
#2 • 10 people in a room have an average  height of 5 feet 6 inches. An 11 th   person, who is 6 feet 5 inches tall,  enters the room. Find the average  height of all the 11 people.  • 21 people in a room have an average  height of 5 feet 6 inches. A 22 nd   person, who is 6 feet 5 inches tall,  enters the room. Find the average  height of all the 22 people.  • Compare the two averages. Which is  bigger, the group of 11 or 22? Can  you tell why?

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#3 • Find the average and the r.m.s
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Ch3.WS - PracticeQuestions TheAverageandthe...

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