Question

Can anyone help with this
{(x)= 0 when x<0 or x>3
f(x)={x^2/9 when 0 13 years ago

Answer 1

yes, it satisfies all the conditions for probability density function.
to find out cumulative function, you just have to integrate it.
to find out mean, integrate xf(x) dx from 0 to 3
to find out variance, integrate x^2 f(x) dx from 0 to 3, then substract the square of mean
square root of the result is standard deviation

Answer 2

can you do the calculation on your own?

Answer 3

trying it out right now. Don't know if its going in correctly.

Answer 4

let me know what you got as answer

Answer 5

mean =1?

Answer 6

and 8 for Std Dev?

Answer 7

no, mean= 2.25, according to my calculation

Answer 8

multiply x with the function to gey mean, that is: x^3 /9
now integrate from 0 to 3

Answer 9

X^2 you mean or did you take the anti first
?

Answer 10

ok ok i seei got it

Answer 11

2.25 :)

Answer 12

okay, now calculate the variance, the way i told ^^

Answer 13

7.5?

Answer 14

no

Answer 15

at first, multiply x^2 with x^2/9, that is x^4/9
now integrate from 0 to 3
then subtract SQUARE of the mean from that

Answer 16

.3375?

Answer 17

correct! now take the square root of it

Answer 18

.5809

Answer 19

yeah, you got the answer :)

Answer 20

Thank you SOO much, was giving me a headache :)

Answer 21

you are welcome, this is a question of statistics, right?

Answer 22

bus calc II, but we going through a statistical section :/

Answer 23

oh, what standard are you in?

Answer 24

bus admin

Answer 25

after high school?

Answer 26

✓

Answer 27

oh, i am still in school :/

Answer 28

just looking at it from a long term wise. Benefit

Answer 29

yeah, which country are you from? may i know?

Answer 30

US, u?

Answer 31

india, nice to 'meet' you :)

Answer 32

Nice :). Nice 'meeting' you too, Thank you much :)

Answer 33

it is midnight there, i guess

Answer 34

btw, can you gimme a medal?
I go to medal begging sometimes

Answer 35

of course!

Answer 36

? how lol

Answer 37

click on best response

Answer 38

✓

Answer 39

yeah, thank you