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I have the steps to this problem but I went wrong somewhere so I don't understand it

okay, so first 450/600 = ?

0.75

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okay now for a 99.7 %, u have to find the Z score for that

the next step is to find out what the standard deviation of thing should be

ohhh see, that was the step I was missing, the standard deviation. Except idk how to do it

oh um also we know the center is definately 0.75 right

yes..

or 75%, some of the choices u are given arent centered around that, so they can eliminated rightway

would it be D?

nvm, all them are centered around 75% cant elimnate any argh

oh okay so what do I do now

C is definitely wrong
71.46% to 78.53%
as it should say 71.46% to 78.54%

Well I wrote all the answers correctly so idk, I just checked

its probably just bad rounding

So it's definitely not C?

What is the Z score u foundÃ‰

the formula for z score is \[z= \frac{ X-\mu }{ \sigma }\]
right...

yes thats another one,. but we cant use that right now

oh... then what do we use

i just mean we have to find Z score, for the 99.7 %

you have to look at that table and chart

okay how do I do that

http://www.statisticshowto.com/tables/t-distribution-table/
this one right

cause this is where I was stuck, I wasn't sure what numbers or whatever to look at on the chart

click on the 2 tail one

wait is it B?

ya hm not sure

ok I just need help cause I need to answer it soon

@ganeshie8 is the question missing info??

so do you know anything..

I'm on my school computer so yahoo is blocked, could you tell me what it says

how about this
http://gyazo.com/d103059ce0cd9eadfd631e125a3f3bc9

no it's still blocked..

thanks so much :)

np

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