What % get 41-44 & 46-49 ?

[Gloamglozer]

^ noob question, what do i put for lower value and upper value?
is this 1 and 30?

thats the range you want, so if you want to find the % of ss above 40, put lower bound as 40 and upperbound as 50

And then "Bob's your uncle".  It's around 8%.

[crappy]

^ noob question, what do i put for lower value and upper value?
is this 1 and 30?

thats the range you want, so if you want to find the % of ss above 40, put lower bound as 40 and upperbound as 50

And then "Bob's your uncle".  It's around 8%.

or, you could say "Robert is your mother's brother", haha lame joke from some movie

[vexx]

thanks.

in normal cdf, i put in
40
50
30
7

and it comes up with cdf=0.074426
whats happening o_o

[crappy]

Yeah that is the percentage, just multiply by 100 and you will have 7.44%

[vexx]

oh i see, so above 40+ is actually 7.44 :O??

[stonecold]

WTF!  It is saying that less than 0.1% get a 50.

Edit: That should have read 0.1%.  Bit late to be doing maths lol.

[crappy]

WTF!  It is saying that less than 0.01% get a 50.

unfortunately

[stonecold]

Think it's a bit more than that because don't around 75 students get a 50 in further from a cohort of approx 25,000.  That is more like top 0.2-0.3%

[crappy]

oh wait, yeah i think so haha,

what did you put in the calc?

[m@tty]

Study scores are rounded to the nearest integer. Thus 40 is really in the range and 50 is really .

[QuantumJG]

let u=30
and SD=7 ( ithink)

and use normalcdf. done

I prefer probability cheat.

[crappy]

let u=30
and SD=7 ( ithink)

and use normalcdf. done

I prefer probability cheat.

no way, the ti 89 cas absolutely rapes ti 83/84

[Gloamglozer]

let u=30
and SD=7 ( ithink)

and use normalcdf. done

I prefer probability cheat.

no way, the ti 89 cas absolutely rapes ti 83/84

+1  We've got "F2 Solve". 

[stonecold]

First I did normPDF(50,30,7) and got 0.000962 which is 0.1%

Then I did what m@tty suggested and went:
normCDF(49.5,50,30,7) and got 0.000533 which is 0.05%  

This is confusing LOL.  And TI-Nspire rapes them all! 

[Gloamglozer]

First I did normPDF(50,30,7) and got 0.000962 which is 0.1%

Then I did what m@tty suggested and went:
normCDF(49.5,50,30,7) and got 0.000533 which is 0.05%   

This is confusing LOL.  And TI-Nspire rapes them all! 

You can't use normPDF...  You must use CDF for all.

And also, The TI-nspire has too many buttons and it's too chunky to carry around.