Question

Hello all, I'm kinda new and need some math help...

Answer 1

a

Answer 2

@INEEDSOMUCHHELP
\(\Large\sf\color{blue}{Welcome~To~OpenStudy!}\)

Answer 3

Thankyou SOOOO Much!

Answer 4

ty soo much

Answer 5

If someone can get someone who can help assist me or give me directions in solving these problems, that would be greatly appreciated!

Answer 6

You're welcome. However, I stink at statistics, since I have never taken it. I'm sorry. You can link to people's names to try to get them to help. For example @ganeshie8

Answer 7

@thomaster @iheartfood @ParthKohli @Preetha @AriPotta @ganeshie8 @HelpBlahBlahBlah @johnweldon1993 @Lyrae @Zarkon @xEminemx14 @Compassionate @VortexAlliby @blurbendy @BTaylor @natsent06 @micahm

Answer 8

yes?

Answer 9

uhhh hold that thought

Answer 10

Oh stats huh? wow this takes me back about 4 years lol

hmm, well the first thing we need for question 1 would be the z-scores

Do you know how to find those?

Answer 11

Hint...the formula is

\[\large z = \frac{X - \mu}{\sigma}\]

so we need the z-score for both 435 and 565

Answer 12

yah, do u want for me to upload a sheet?

Answer 13

oh ok one sec

Answer 14

No that wont be necessary :)

Answer 15

ok? so what do I do?

Answer 16

So for the z-score for 435

we take X to be 435...the mean \(\large \mu\) will be 500 and the standard deviation \(\large \sigma\) will be 65

so if we plug that into that formula up there...what do we get for 'z'?

Answer 17

ok one sec

Answer 18

-1

Answer 19

Correct...so keep that to the side for a moment while we do the same thing for the z-score of the 565 that we have

again, same formula except this time X = 565

Answer 20

ok one sec

Answer 21

1

Answer 22

Indeed...okay...we have our 2 z-scores...that's all we need to begin to figure this out

What we need to do...is take those 2 values for 'z' and look at a z-score table and find the corresponding value

We want the probability that Z < 1
and the probability that Z < -1

So look on your table (I'm assuming you have one...I certainly do not lol) and look for Z = 1..and tell me what decimal is written in the column :)

Answer 23

haha give me one second

Answer 24

Of course :)

Answer 25

ty for being patient and helping me one more sec lol

Answer 26

can u find one cuz i cant?

Answer 27

Ah got one...

http://www.utdallas.edu/dept/abp/zscoretable.pdf

so do me a favor and look at that page :)

Answer 28

for -1 it converts to 0.1379 and for 1 it converts to 0.8643

Answer 29

Ahh now be careful....what you have chosen are in 2 different rows!

if you look carefully at the toop of the graph...you'll see 0.00...0.01 etc...you chose one from the 0.00 row...but then you chose the other from the 0.09 row

gotta be careful there...

to look at the 0.0 row for each instance...and then tell me what the z-score is :)

Answer 30

oh ok one sec

Answer 31

1 is .8413

Answer 32

@johnweldon1993