00:01
So for this problem, it says determined by inspection, we don't have to do any calculations, which data set has the greater standard deviation.
00:10
So you have set a, which goes from 60, 62, 65, 68, 70, 71, 74, and 75.
00:18
So i see that the range of that, the lowest is 60 and the highest is 75.
00:24
And in dataset b, the lowest is 50 and the highest is 80.
00:28
So the greatest standard deviation is the data set that is most spread out from the mean.
00:35
And dataset b is way more spread out than dataset a.
00:41
Dataset a goes from 60 to 75 and data set b goes from 50 to 80.
00:47
So set b is more spread out than set a.
00:52
So that's the answer to number five.
00:55
I'm in number six.
00:58
I think there's a typo here because it says, use the dot plots from sixth grade class to answer questions 9, 10, and 11.
01:07
I think they meant to use those to answer questions 6, 7, and 8.
01:12
So it says which of the plots, a, b, or c is most likely to represent the number of days.
01:18
Each student in a class has been absent in one month.
01:23
So typically students are not absent from school.
01:26
So in number six, as far as absentee rates, i would think plot a would represent the likely plot of students being absent.
01:38
So there was one, two, three, five students that were not absent at all.
01:43
There were one, two, three, four students that were absent one day, three students absent two days, et cetera.
01:49
And there was only one student absent eight days.
01:52
I would think the larger number of absences would be more, way more rare.
01:57
So i would say plot a for number six, because you're talking about absences in one month.
02:04
So plot b and plot c just seemed like way too many absences to me for a student.
02:12
So number seven, which of the plots is most likely to represent the number of questions? each student got correct on a fairly easy 10 question quiz.
02:21
Well, if it's an easy 10 question quiz, then i would say plot b.
02:27
Would be the answer to that one because two students got 10 questions right.
02:33
And if it's a fairly easy test, you would expect like a large number of good grades.
02:40
So the number of students who got eight, nines, and tens were 11, three, four, five, six, seven, eight, nine, eleven students got eight nines and tens.
02:51
Not very many people, only one student got a four...