Question

help please c:

Answer 1

I think that it is A, but I'm not sure.

Answer 2

good, A is correct!

Answer 3

this type of sample is a voluntary response sample

Answer 4

Thanks! Can you help with some more, please?

Answer 5

sure

Answer 6

Thank you! c:

Answer 7

I also have some questions that I've already answered, but I just want to know if I'm right.

Answer 8

The picture I just post (#6), I do not understand what they want me to do.

Answer 9

hm well

Answer 10

they want you to estimate the average of each graph

Answer 11

Ok.

Answer 12

so for average we would simply add all the dots together and divide by how many dots there are?

Answer 13

yeah

Answer 14

Ok.

Answer 15

So for online customers, I added all the dots together and got 100.

Answer 16

since each dot represented 10 customers.

Answer 17

good, but how many total packs did the customers buy?

Answer 18

um. What do you mean by that?

Answer 19

well, the graph tells you how many customers bought how many packs, right?

Answer 20

yes

Answer 21

so, looking at the first graph

Answer 22

it has one dot for 4

Answer 23

yes

Answer 24

so, that means 10 customers bought 4 packs. how many packs total?

Answer 25

40 packs?

Answer 26

great!

Answer 27

now we repeat the same process for the other columns

Answer 28

Oh! so we do that way. OK i will try it now

Answer 29

540 packs in total for the first graph?

Answer 30

hm

Answer 31

and if we divide that by 10 dots, we would get 54 right?

Answer 32

yes

Answer 33

but remember each dot = 10 customers

Answer 34

so total number of packs/total number of customers = 540/100 = 5.4

that's our average

Answer 35

with me so far?

Answer 36

Oh! Ok. yes i understand so far

Answer 37

good, now we do the same thing for the lower graph

Answer 38

So I would repeat this process with the other graph

Answer 39

yup

Answer 40

let me know what you get

Answer 41

2.8?

Answer 42

wow that was fast

Answer 43

yeah c:

Answer 44

that sounds right

Answer 45

ok.

Answer 46

so we can round 5.4 down to 5 and 2.8 up to 3

Answer 47

so the average for online customers = 5
average for walk ins = 3

Answer 48

So the online cutomer would have an average of buying 5 packs and walk-in customers would have an average of buying 3 packs?

Answer 49

good

Answer 50

Thanks!

Answer 51

so answer choice A

Answer 52

no problem!

Answer 53

Check please?

Answer 54

good! that's right

Answer 55

I have about 5 more questions. About 3 to be checked and 2 that I'm confused on.

Answer 56

sure

Answer 57

I hope I'm not wasting your time ><

Answer 58

oh of course you're not wasting my time, that's why i'm here ^^

Answer 59

^^ thanks. I just feel bad that's all :(

Answer 60

#8 is correct, good job

Answer 61

Thanks! ^-^

Answer 62

the next question is the last question that needs to be checked, and number 11 and 12 are the last two that I don't understand *cry*

Answer 63

hm not quite

Answer 64

Hm. OK. I'll look over it again really quick c:

Answer 65

the math vs. science class isn't the reason why the sample is in valid

Answer 66

when we pick a sample, we want it to be as random as possible

Answer 67

yes

Answer 68

picking all students from one class isn't a good idea

Answer 69

Oh. Oops i didn't read the choice carefully.

Answer 70

it would be better to just pick randomly from a whole list of students

Answer 71

no worries

Answer 72

so it's C

Answer 73

Ok. I was about to say that. I just saw that answer. I'm so sorry for my silly mistake.

Answer 74

Thanks for catching that :)

Answer 75

no problem

Answer 76

well, first we want to add up all the fish in the table

Answer 77

Yes.

Answer 78

I got 200

Answer 79

then we find the fraction of grass carp

Answer 80

Then, I did 61/200 and got 0.305

Answer 81

good! then just multiply that by 800

Answer 82

yes

Answer 83

So it is right?

Answer 84

yes, 0.305 is right

Answer 85

thanks

Answer 86

Last two questions, please

Answer 87

now we multiply by (0.305 * 800) = ?

Answer 88

oh hold on

Answer 89

244