Question

Can someone help me

Answer 1

so let's see here
we have to openings to be filled yes?

Answer 2

two*

Answer 3

?

Answer 4

I'am asking yo do you agree that there are only two spots to fill by two candidates

Answer 5

o oh yes

Answer 6

good! now do you agree that we need to choose two out of 4?

Answer 7

But theres 5 students

Answer 8

oh sorry 2 out of 5 :) see I'm making you think lol

Answer 9

Lol

Answer 10

now I'am sure you are following hehe

Answer 11

Yeah

Answer 12

so we have 5 choose 2 correct?

Answer 13

that would give us the chances that two are selected!

Answer 14

assuming that all candidates have equal chance to be selected!

Answer 15

so do you know how to compute 5 choose 2?

Answer 16

Compute?

Answer 17

yes! you should have this formula \[\Large C_{2}^{5} \]

Answer 18

?

Answer 19

I didn't learn that yet

Answer 20

\[C_{k}^{n}=\frac{n!}{k!(n-k)!}\]
you sure you didn't learn this

Answer 21

Yeah

Answer 22

you did it or not?

Answer 23

I never done that

Answer 24

Is there another way?

Answer 25

hmm this changes the whole situation then

Answer 26

hmm don't know what did you learn so far,
did you learn any arrangement method?

Answer 27

No I'm in understanding probability of compound events

Answer 28

compound events?

Answer 29

Yeah

Answer 30

i'm asking what do you mean by compound events?

Answer 31

never hear that in probs

Answer 32

That's the name of the lesson I'm doing

Answer 33

hmm anyways let me see how else we can do this

Answer 34

K

Answer 35

P(Emma and a boy)=P(Emma)p(a boy)
p(emma)=1/5 and P(a boy)=3/5
is besty a name of a girl?

Answer 36

did you do \[P(A\cap B)\]
when A and B are independent events or not

Answer 37

Yeah I'm learning that! :)

Answer 38

okay so we are dealing with dependent events yes?

Answer 39

Yes and I got 12

Answer 40

12 what?

Answer 41

probability is never bigger than 1 you know

Answer 42

what is the p(Emma)?

Answer 43

1/5

Answer 44

and P(a boy is chosen)=?

Answer 45

i assumed above that besty is a girl not sure about the name lol

Answer 46

3/5

Answer 47

then 1/5 times 3/5 is what?

Answer 48

3/25

Answer 49

good! that should be the first
now prob that emma is not choosen

Answer 50

let me see you do that one

Answer 51

3/4 × 1/4 = 4/16 = 1/4

Answer 52

hmm can't see what you did
use the drawing box

Answer 53

I can't

Answer 54

well anyway this what you need to use
\[P(A^c)=1-P(A)\]
where \[A^c\] is the complement of A
for our problem A is choosing Emma
P(Emma)=1/5
so P( not choosing Emma)=1-P(Emma)

Answer 55

1 × 1/5

Answer 56

yes

Answer 57

OK and I got 1/5