Question

my question is in the comments, medal for your help

Answer 1

the other two are as follows:
1/2
1/8
im not sure about 1/8 though

Answer 2

yes, greater than 5 is 6,7 or 8
each has the same chance ⅛ that we can add up: ⅜

Answer 3

Pr( x <= 4) means Pr of 1,2,3 or 4
add up those probabilities

Answer 4

ok so we agree the first is 3/8 good
now for the second one i need you to show me how to do that

Answer 5

what am i adding up

Answer 6

you add up the P(1) + P(2) +P(3) + P(4)
they are all ⅛ so it's not too hard

Answer 7

the mean is found by adding up X * P(X) for all the x's
notice this is the same as adding up the x's , and then dividing by 8

Answer 8

so for the second one it should be 4/8

Answer 9

yes P(x<=4) is 4/8 but I would simplify that to ½

Answer 10

ok and for the mean is 1

Answer 11

its either 1 or 1/8

Answer 12

@phi

Answer 13

the easy way to find the mean when all of the numbers have the *same* probability is to first add up the numbers
then multiply by ⅛

what is the sum of the numbers ?

Answer 14

the sum is 36

Answer 15

yes, now multiply by ⅛ to get the mean
⅛ * 36 or 36/8 is the answer. it simplifies to 4.5

Answer 16

i got 4.5

Answer 17

yes