Question

A random variable has the probability distribution table as shown. Calculate P(x ≥ 5)

Answer 1

is that a typo that the entry for x = 7 is missing?

Answer 2

i have to find what 7 is

Answer 3

oh ok, keep in mind that all of the probabilities must add to 1

Answer 4

so if it's currently x



then

0.2+0.2+0.1+x+0.1 = 1

Answer 5

yeah thats what i thought but in the answer key it says its 0.6 but i just don't get how you get that?

Answer 6

unless he made a typo

Answer 7

well that's the answer to P(X >= 5)

Answer 8

that's not the value of x

Answer 9

ohhh okay so how would you calculate that?

Answer 10

solve 0.2+0.2+0.1+x+0.1 = 1 for x and tell me what you get

Answer 11

x=.4 right?

Answer 12

good

Answer 13

let's update the table