I’m trying to help my kid with his homework. I thought I was good at statistics, but it turns out I am not. Or at least, I can’t figure out the right numbers to use in the formulas. Can someone spot check at least my initial logic? I feel the question is worded in a very weird way.
I want to say that there are 84 E jobs, 16 L jobs, and 14 (rounded) P+L jobs. Is that correct?
84% of a contractors jobs involves electrical work. 75% of a contractors jobs involve plumbing work. Of the jobs that involve plumbing, 90% of the jobs also involves electrical work.
Let E = jobs involving electrical work
L = jobs involving plumbing work
Suppose one of the contractors jobs is randomly selected.
Using the sixth Excel worksheet,
a) Find P(E).
b) Find P(L).
c) In words, what is P(E | L).
d) Find P(E | L).
e) Find P(E and L).
f) Are E and L independent events? Why or why not?
g) Find P(E or L).
h) Are E and L mutually exclusive? Why or why not?
Someone please help. Never been so glad to be out of school in my life.