Question

questions/ picture posted

Answer 1

@mathmate

Answer 2

@amistre64

Answer 3

PLEASE CHECK if ALL MY ANSWERS are CORRECT

Answer 4

1,2,3 are ok

how did you get Q4's answer?

Answer 5

is it actually 27/36?

Answer 6

if you color in the squares representing event A and the squares for B
and count the squares you do not get 19

Answer 7

which is 3/4?

Answer 8

some squares are in both event A and event B. But you only count those squares once.

Answer 9

oh... so then..

Answer 10

so get a crayon and color in all squares where one of the die is a 4
you will get a cross

then color all the squares that have a number bigger than 5
how many squares are colored in ?

Answer 11

when u say where one of the die is 4 its all the numbers either in the column 4 or row 4 right?

Answer 12

yes

Answer 13

11 where one die is a 4 &

Answer 14

17 where sum is greater than 5

Answer 15

so is it total 16/36?

Answer 16

4/9 ?

Answer 17

event A OR event B means if either event happens.

I just color in each square for A and for B. then count the squares.
I get 28 total

Answer 18

oops, i got 28 too

Answer 19

so 28/36

that simplifies

Answer 20

7/9?

Answer 21

yes Q4's answer is 7/9

Answer 22

is Q5 correct?

Answer 23

P(A|B) means prob of A given B

"given B" means color in all the squares that are event B
from Q2, you know that there are 26 squares colored in. that will be the denominator in P(A|B) (instead of 36)

now of the 26 squares that are colored in, how many are event A? that will be the numerator

Answer 24

9???

Answer 25

yes 9 out of the 26 are event A
what is P(A|B) ?

Answer 26

why is it 9 out of 26?? and not 36??

Answer 27

P(A) means how many "A squares" out of the total number of squares (= 36)

P(A|B) means how many "A squares" out of the "B squares" ?
there are 26 B squares. of those 26, 9 are "A squares"

Answer 28

ohh

Answer 29

so.. its just 9/26?

Answer 30

yes

Answer 31

oh ok. that's the answer then.

Answer 32

yes.

Answer 33

also what about these two problems? i know the 2nd part is wrong and i need help getting the right answer, but im not sure about part I. I think its right

Answer 34

I think for part 2 you should multiply each term by the probability of that term before adding them up

Answer 35

.. so wait

Answer 36

like (2-7)^2* (1/3)??? like that?

Answer 37

but is part 1 correct

Answer 38

where did you get 1/3... use the P(x) number given up top. in this case, for x=2 use P(2)= 1/36

Answer 39

i meant 1/36

Answer 40

and then add em up together?

Answer 41

can u do it too so i can make sure its the same answer u get?

Answer 42

part 1. is ok

part 2 is the same idea, except you put in (x-7)^2 * P(x)

(in part 1 you did x * P(x) )

Answer 43

ok.. in the end i got...

Answer 44

35/6

Answer 45

yes, I think that's ok

Answer 46

ok..

Answer 47

also, how would u make this venn diagram??

Answer 48

like as a sketch what would it look like?

Answer 49

a venn diagram of what ?

Answer 50

Create a Venn diagram that represents the following:

In Area 1, senior girls

In Area 2, junior girls
In Area 3, senior boys
In Area 4, junior boys

Label each area and title the Venn diagram as well as each of the two circles.

Answer 51

its based on this problem, because i need to solve a problem using the venn diagram so

Answer 52

There are 70 high school students attending the annual Johnson High School junior and senior dance. Of the 70 students attending, 30 of the students are girls, 24 of the students are seniors, and 6 of the girls are seniors.

Answer 53

1. Given that a student is a senior, what is the probability that the student is a girl? Show your work.


2. Given that a student is a girl, what is the probability that she is a junior? Show your work

Answer 54

juniors and seniors would be different boxes (or circles)

so start with

Answer 55

for 1, i got 1/4
for #2, i got: 12/15 ???

Answer 56

or in simplest form: 4/5

Answer 57

no isn't a venn diagram in circles?? it is.

Answer 58

some juniors and some seniors are girls.
ditto for boys
divide the boxes in half and label the top part girls and the bottom part boys

Answer 59

so what would the venn diagram look like? since its circles..

Answer 60

make it a circle and divide the circle into quarters

label the top half of the circle "girls" and bottom half "boys"
label the left half "jr" and the right half "sr"

Answer 61

so like how many sections would it have?

Answer 62

like this??? :(

Answer 63

are my two answers to #1 and #2 correct though?

Answer 64

or like this??? right?