Question

set j contains the integers 1-20 inclusive, if a number is chosen at random from J - what is the probablity that the number will be greater than 10

Answer 1

i know it is 21 total integers
there are 11 numbers greater than 10

Answer 2

50%, i believe. not very good with probabilities though.

there are 10 numbers that are <10, 10 numbers >10
1<=x<=20
aka 20 numbers

100% chance of choosing all numbers 1-20
50% chance of choosing either less than or greater than 10 numbers

therefore, it's 50%.

Answer 3

I see - 20 numbers
10 greatere than 10
so 10/20 = 1/2

Answer 4

thanks much. my son is studying for SAT. his tutor told him to do the +1 to count integerss, but that is not for inclusive. Thanks again

Answer 5

indeed inclusive just means include the numbers at the endpoints 1-20

exclusive means don't count the endpoints (so it would have been 2-19)

she was thinking something else for the integer thing i think..