Question

Am I correct? :) Thanks!

Answer 1

@Hero

Answer 2

@mathstudent55

Answer 3

how many total numbers are there ?

Answer 4

17

Answer 5

Yes ! so the median is 9th observation

Answer 6

to get the first quartile, you need to find the median of first 8 observations

Answer 7

whats the median of first 8 numbers ?

Answer 8

27.5 o:

Answer 9

Am I correct on this one? @ganeshie8

Answer 10

Need help finding the IQR...

Answer 11

the -5 is correct

Answer 12

what numbers do you think are the quartiles...?

Answer 13

24 and 65..

Answer 14

`min, Q1, median, Q3, max`

Answer 15

24 is the minimum and 65 is the maximum score...

so what numbers are left...?

Answer 16

36,42 and 57

Answer 17

57-36?

Answer 18

You got it !

Answer 19

that will give the IQR... 42 is the median

Answer 20

I need the IQR lol.

Answer 21

well use

IQR = 57 - 36

Answer 22

How do I do this one?

Answer 23

do you have a calculator...?

Answer 24

yes..

Answer 25

finding the mean should be trivial,
can u find the mean ?

Answer 26

Yes..

Answer 27

well can you put it in stats mode and use the functions...to find the standard deviation

Answer 28

19?

Answer 29

what is it ?
once u have the mean, subtracting it from the observations is also trivial,

what are the differences ?

Answer 30

Yes ! mean = 19

Answer 31

so the answer is 19? final answer..?

Answer 32

19 is mean, not standard deviation

Answer 33

Ohh so what do I do now?

Answer 34

for standard deviation, u need to find RMS (root mean square) value of the differences

Answer 35

so the answer is square root 2?

Answer 36

you need to get friendly wid this nasty looking formula :
http://www.revisionworld.com/sites/revisionworld.com/files/imce/sdeviation2.gif

Answer 37

sqrt(2) is right !

Answer 38

have we passed the quiz yet..?

Answer 39

btw thats for population standard deviation ^

for sample standard deviation, use this :
http://4.bp.blogspot.com/-ClgskLBxLjQ/Ut-smPagORI/AAAAAAAAA4k/q_u7caTUj-0/s1600/stdev_s.gif

Answer 40

assume its a `population` if nothing is specified or its not clear based on context

Answer 41

Help @ganeshie8 ?

Answer 42

Isn't it 12?

Answer 43

it is

Answer 44

yes ! we multiply all the choices as u want to selec them one after another; its same as selecting pant and shirt to wear

Answer 45

thats the fundemental theorem of counting

Answer 46

Am I right?

Answer 47

Look :
you got 2 states, and each state has 13 counties

Answer 48

that means there are a total of 2*13 = 26 counties, right ?

Answer 49

So 26..

Answer 50

right

Answer 51

No, the question is about cities, and NOT about counties

Answer 52

So you have 26 counties, and each county has 16 cities

Answer 53

can u tell how many total cities are there ?

Answer 54

416

Answer 55

Yes ! so basically this is also same as previous problem :
select a state ---> select a county ----> select a city

Answer 56

2 x 13 x 16

Answer 57

```
Bag1 : yellow, red, blue
Bag2 : yellow, red, blue
Bag3 : yellow, red, blue, green
```

Answer 58

And you want to pick one ball from each bag, right ?

Answer 59

yes

Answer 60

sorry was not getting notifications @xXxBambyGirlxXx

Answer 61

3 ways for Bag1,
3 ways for Bag2,
4 ways for Bag3

so total outcomes = 3x3x4

Answer 62

all the last 3-4 problems you have asked are equivalent... they all use the same principle : product rule of counting