Question

http://prntscr.com/mb7nyw

Answer 1

@Vocaloid

Answer 2

it's been a while since i've done these but you would probably start by making a probability tree

Answer 3

since we want "people who will be identified as having diabetes" we want to calculate the percentage of people who will test positive, then multiply by 300 people

Answer 4

so we add the percentage of people who will test positive then multiply that number by 300?

Answer 5

but theres two numbers

Answer 6

so (74.7% of 7% ) + (12% of 93%) will give you the total percentage of people who will test positive

Answer 7

well 74.7% of 7% is 0.05229
and 12% of 93% is 0.1116

basically 5 plus 11 is 16. so A?

Answer 8

... actually, that only gives you the percentage of people who test positive, you would then multiply that by 300 since we want the number of people out of 300

but that isn't one of the answer choices. hm.

Answer 9

uhhh maybe I can ask someone about this

Answer 10

Hmm did you find anything yet?

Answer 11

maybe divide it by 300? because then it would be about 18.75 and there is 18 as a choice

Answer 12

hmmm I don't think there's any reason to divide

Answer 13

Im not sure tbh

Answer 14

We can move on if you're not sure

Answer 15

ok

Answer 16

I just realized I miscalculated 100 - 78% as 12% instead of 22% but even correcting that error doesn't really help

Answer 17

hmm okay

http://prntscr.com/mb877i

Answer 18

it's just (yellow marbles)/(total)

Answer 19

1/10 so B

Answer 20

good

Answer 21

http://prntscr.com/mb8arz

Answer 22

there's replacement, so it's just

(red marble/total marbles)(black marbles/total marbles)

Answer 23

1/15?

Answer 24

15 total marbles
5 red
4 black

so (5/15)(4/15)

Answer 25

8/75 ?

Answer 26

(5/15)(4/15) = 20/225 = 4/45

Answer 27

ohh i accidentally did the calculations wrong and did the blue one.

Answer 28

http://prntscr.com/mb8j87

Answer 29

you just need to multiply (# of pants)(# of shirts)(# of shoes)

Answer 30

48

Answer 31

http://prntscr.com/mb8kni

Answer 32

permutation formula for n = 8, r = 4

Answer 33

supposed to be n! / (n-r)! just in case

Answer 34

also I asked about that diabetes question w/ a friend and they also said they didn't get any of the solutions as an answer

so my best guess they didn't take the 300 into account and just reported the percentage of positive test results, in which case 16?

Answer 35

Okay so im just gonna put 16 for that, and can you explain more for question 5?

Answer 36

@Vocaloid

Answer 37

"permutations of 8 letters taking 4 at a time"

the permutation formula is n! / (n - r)! where n is the total # of items you are choosing from (8) and r is the number of items being chosen at a time (4)

Answer 38

So 1680?

Answer 39

am i correct @Vocaloid

Answer 40

yes