Question

If a sample of 32 runners were taken from a population of 201 runners, could refer to the mean of how many runners' times?

A. 201
B. Both 32 and 201
C. Neither 32 nor 201
D. 32

Answer 1

@Daniellelovee

Answer 2

i dont get your question

Answer 3

they want you to find the mean
(you know range median mode, etc)

Answer 4

it has one of those in between the runners and could but idk what that is.

Answer 5

o.O idk if its you drawing skills but what is that thing?

Answer 6

idk

Answer 7

is it a U symbol?

Answer 8

probably i honestly dunno

Answer 9

because if it is then that means universal or in other words all the numbers in a set

Answer 10

it doesnt really look like on though so

Answer 11

should i just take a guess?

Answer 12

I think 32 because the mean is like finding range (your GPA for examples) is found by adding percentage and then dividing by the number of classes
but in here they are telling you that you have 201 classes in total (an example) but they are only giving you the score of 32 classes then which range can you find...
@mathmate am I correct?

Answer 13

\(\mu\) is the mean.
The best is to post an image of the question.
It's hard to miss out part of the question.

Answer 14

yes thats what it was... But i can't take pictures on my school computer. :(

Answer 15

xBar (x with a bar on top) is the sample mean (of the 32).
\(\mu\) generally refers to the population mean (201).
This applies if Tallan knows these two terms.
Does the question say "could \(\mu\) refer to the mean of ..."?

Answer 16

@Tallan
Have you done sample mean and population mean in your course? If yes, then the above two symbols apply. If not, it will depend on your course.

Answer 17

yes it says could refer to the mean of how many runners' times? @mathmate

Answer 18

The answer depends on whether you have learned about the difference between sample mean (xBar) and population mean (\(\mu\)). I think you have, but you need to confirm.

Answer 19

I think that is too advanced for his pace on his previous questions but anything is possible at this point

Answer 20

32 (sample) out of 201 (population).
The sample mean (out of 32) is (almost) never the same as the population mean, and it varies from sample to sample. That is why it is given a different symbol (xBar), while population mean stays the same all the time (as long as the population does not change).
Have you done that in you class? Check your notes, please.

Answer 21

@Tallan answer :p

Answer 22

@Tallan
ok, I'll explain it one more time.
\(\mu\) is used by a lot of people as an abbreviation for "mean".
In statistics, it is used to represent the population mean, for example, the mean age of a whole school. If we take a sample, say 24 students and find the mean of the 24 students, the (sample) mean will vary depending on the sample, hence we use a different symbol (xBar, x with a bar on top, I don't know how to type it yet) to indicate that it is a variable, while the population mean \(\mu\) is a constant.
Unfortunately, \(\mu\) is also used by a lot of people as an abbreviation for "mean", any mean, especially in elementary statistics. That is why I have to be careful to understand your context, i.e. what you have learned before, or not. I am not trying to test your knowledge (it's not my job to do that, lol).
:)

Answer 23

yeah but I believe the options that they are providing him with can help you determine what the meaning of the symbol wants him to look for.

Answer 24

do they give you a formula?

Answer 25

on the lesson?

Answer 26

not that i know of... I cant go back into it now anyway. @Daniellelovee

Answer 27

i still think its A @Daniellelovee

Answer 28

What is the mode of the following data values?

87, 19, 11, 52, 11
mode repeats right?

Answer 29

@Daniellelovee

Answer 30

yeah the mode is the number that repeats

Answer 31

ok well then thats easy its 11

Answer 32

yeah lol I'm finally sure of an answer XD

Answer 33

Ben is taking three AP classes and two regular classes. His AP classes count twice as much as his regular classes in his GPA. Each A is worth 4 points, Bs are worth 3 points, Cs are worth 2 points, and Ds are worth 1 point. What is Ben's GPA?

Class Ben's grade
AP English B
AP Government B
AP Algebra II A
Spanish B
Physics D

A. 3.0
B. 1.7
C. 4.0
D. 2.8

Answer 34

the grades are right next to the class.. they apparently didn't have spaces. :P

Answer 35

they want you to find the mean (add all the values and then divide by the number of classes) :)

Answer 36

did you get it?

Answer 37

he has a gpa of 2.8

Answer 38

yup :)

Answer 39

wait

Answer 40

wait read the above your not done

Answer 41

Ben is taking three AP classes and two regular classes. His AP classes count twice as much as his regular classes in his GPA.

Answer 42

4.0?

Answer 43

?

Answer 44

shouldnt it be 3? since you have 3+3+3+3+4+4+3+1=24 so 24/8?

Answer 45

oh i added the 3's together..

Answer 46

and the 4's

Answer 47

what?

Answer 48

lol explain what you did o.O

Answer 49

ok i did 3+3=6 so i did 6 for my b's so 2 6's. for my A's i added 4+4=8 so 8,6,6,3,1

Answer 50

I think i just did it differently that was wrong.

Answer 51

yeah but 24/5 =4.8 which is not an option....

Answer 52

use your guessing skills lol :p

Answer 53

what did you get?

Answer 54

i got 3.0 :P sha'll i put it in?

Answer 55

do you think thats right lol I dont want to feel guilty again

Answer 56

yea

Answer 57

ok then go for it :p :)

Answer 58

you were right :D

Answer 59

haha yeah!
http://themavesite.com/TMS-Pictures/Epic/Memes/FreddieMercury.png

Answer 60

A baseball stadium offers tickets with different prices, depending on the location of the seats. If it decreases the prices of all tickets by $15, what will happen to the median price of the tickets?

A. It will stay the same.
B. It will increase by $15.
C. It will decrease by $15.
D. There is not enough information to answer the question.

Answer 61

how many questions left?

Answer 62

the median is the number in the middle

Answer 63

3 questions*

Answer 64

C?

Answer 65

I think so too

Answer 66

was it right?

Answer 67

yes i got it right i got a 90% on it i just finished

Answer 68

I'm so proud of us :') xD lol

Answer 69

:)

Answer 70

can you help me with the next quiz?

Answer 71

might as well lol

Answer 72

If the standard deviation of the data values in a sample is 13, what is the variance of the data values?

A. 169
B. 225
C. 361
D. 289

Answer 73

I dont remember how to do this hold on I'll be on google

Answer 74

ok

Answer 75

the Standard Deviation is just the square root of Variance

Answer 76

so just multiply to the second power

Answer 77

makes sense?