Help with probability exercise

[carolinae]

I don't know if this is where it should be, buuut I need help :whoops:

I need to find the probability of throwing 2 ten-sided dice and having the sum be greater than 15. Could anyone help?

[Desuetude]

Draw a table with 1-10 down one side and 1-10 down the other, fill in the table accordingly by adding up the 2 numbers on the sides that connect with each box. Count how many are 15+ and this number is the numerator. The denominator is 100 (10*10), this fraction is the probability and I'm sure it'll be able to be simplified. If you need a picture I could quickly draw one but it's pretty simple, I'm just awful at explanations and I know this is a long, drawn out way of working it out but it's not difficult and you don't even have to draw the whole table, do the last couple of numbers e.g. start with 10 rather than 1.

[Magenta]

Draw a table with 1-10 down one side and 1-10 down the other, fill in the table accordingly by adding up the 2 numbers on the sides that connect with each box. Count how many are are 15+ and this number is the numerator. The denominator is 100 (10*10), this percentage is the probability and I'm sure it'll be able to be simplified. If you need a picture I could quickly draw one but it's pretty simple, I'm just awful at explanations and I know this is a long, drawn out way of working it out but it's not difficult and you don't even have to draw the whole table, do the last couple of numbers e.g. start with 10 rather than 1.

It says something about me that I'm a 20-year-old university student who has no idea what you're saying because I've forgotten every math class I've ever taken. Out of sheer curiosity (not because I actually need this for homework), could you actually draw that out?

[-]I mostly just read this thinking, oh yeah, I can totally do this and can't so now I feel like I need the refresher just for reasons.[/-]

[carolinae]

I think I did it correctly, the 'shaded' area would be the sums greater than 15 (16,17,18,19&20).


https://twitter.com/regalxcarnation/status/670717428893003776

[carolinae]

It says something about me that I'm a 20-year-old university student who has no idea what you're saying because I've forgotten every math class I've ever taken. Out of sheer curiosity (not because I actually need this for homework), could you actually draw that out?

[-]I mostly just read this thinking, oh yeah, I can totally do this and can't so now I feel like I need the refresher just for reasons.[/-]

Draw a table with 1-10 down one side and 1-10 down the other, fill in the table accordingly by adding up the 2 numbers on the sides that connect with each box. Count how many are are 15+ and this number is the numerator. The denominator is 100 (10*10), this percentage is the probability and I'm sure it'll be able to be simplified. If you need a picture I could quickly draw one but it's pretty simple, I'm just awful at explanations and I know this is a long, drawn out way of working it out but it's not difficult and you don't even have to draw the whole table, do the last couple of numbers e.g. start with 10 rather than 1.


I answered it. It's up there.

[Desuetude]

Yup, there you go xD its effort drawing out the table and all but the visual is good to get an idea of how to do it and you should be able to figure out quicker ways of working it out as you practice.

Edit: Also, I messed up saying 'percentage' I meant fraction but obviously wasn't thinking, sorry.