Question

MEDAL AND FAN :D

P(X>85)=P(X−62/10>85−62/10)=?

Answer 1

discrete probab?

Answer 2

the full question is:

In the city of Longskank, the mean weight is 62 and the standard deviation is 10. What is the probability that a person chosen at random weighs more than 85 kg?

but i thought that that equation was how u solve it - i just didnt know how to work with it

Answer 3

why did you set this P(X−62/10>85−62/10)

Answer 4

so do u know the answer @xapproachesinfinity???

Answer 5

cuz i thought that that was easier

Answer 6

Not really, i forgot how to deal with this kind of probab
just trying if i can remember something lol sorry

Answer 7

sorry my internets being slow i didnt realize

Answer 8

okayyy...

Answer 9

@ikram002p

Answer 10

@kirbykirby maybe u could help me on this one too sorry

Answer 11

Yes you did approach this correctly. You have \[P(X>85)=P\left(\frac{X-62}{10} >\frac{85-62}{10}\right)=P(Z>2.3) \]
So now you can use a standard normal table to find this quantity, or use a calculator/program that has a function to find this

Answer 12

do u know what the button would look like on the calc?

I have a Ti-nspire here so that should have the function?

Answer 13

um, I don't have a calculator that has these functions :( so I'm not sure which button you use

Answer 14

ok thats cool

Answer 15

did you ever use normal tables?

Answer 16

not rly but im sure google would tell me?

Answer 17

maybe if you search your calculator. What did you use before to find these probabilities? Otherwise, you can
1) learn to use normal tables
2) Try this here: http://www.wolframalpha.com/input/?i=P%28Z%3E2.3%29+where+Z~N%280%2C1%29

Answer 18

@kirbykirby where can i review this

Answer 19

Um well if you need to use your calculator, I suggest going on the texas instruments website and search for your calculator model. You should be able to find the instructions for it as a PDF file.

If you want to learn to use normal tables, you can try here: http://courses.wcupa.edu/rbove/Berenson/10th%20ed%20CD-ROM%20topics/section6_1.pdf

Answer 20

thanks so much

Answer 21

yw! :)