Question

Need Help, kinda.

Answer 1

If a patient doesn't receive treatment for a certain injury within 2 hours after injury, the patient's chance of survival starts decreasing by 15% each hour. If no treatment has been given within 4 hours after injury, roughly, what chance of survival will the patient have?

Answer 2

70%
72%
75%
77%
80%

Answer 3

I know the answer i just need to know if other people know how to get there because i got it wrong the first time.

Answer 4

let's say the patient has 100% chance to survive within the first two hours
at hour 3, the patient doesn't get treatment, so what are the chances now?

Answer 5

85%

Answer 6

It's 15% per hour. We're talking 3 hours.

Answer 7

now extend it out another hour

Answer 8

4*

Answer 9

I know the answer but i got i wanted to see if anyone else would get it right the first time because the first time i did not get it right. So if you guys are able to get the right answer ill know easier how to get there.

Answer 10

Ok but what was your answer?

Answer 11

No i cant tell , because what if it were a test what would be your first choice?

Answer 12

That's kind of our logic here. We don't want to risk giving you the answer if you didn't actually choose one.

Answer 13

Well, then ill tell u its not D.

Answer 14

It doesn't matter if you're wrong, we're here to help not make fun of you.

Answer 15

No but the way the asked it is kinda confusing so i was wondering if was just me.

Answer 16

Ok we're not getting anywhere so let's just break it down.

We're given 4 hours. Recall that it says the effects of survival chance decrease *after the first two hours*.

Answer 17

And it's 15% per hour that's being removed, soooo....

Answer 18

Ok, so after i move it down 15% it will be 85% so then afterward it will be 70%

Answer 19

Yep.
15 * 2 = 30
100 - 30 = 70

We're assuming they have 100% survival chance given the options.

Answer 20

So its 70%?

Answer 21

Yeah.

Answer 22

Thats not it.

Answer 23

What

Answer 24

that exactly what i thought.

Answer 25

That has to be an error.

Answer 26

So do you guys see any other available answer

Answer 27

Unless there is some miraculous chance a patient has 110% chance of surviving.

Answer 28

No, that's the only answer there is....

Answer 29

Ikr

Answer 30

It's definitely an error on their part, it has to be 70.

Answer 31

Jim do u think its another answer.

Answer 32

He's on another question atm.

Answer 33

Or possibly

Answer 34

O

Answer 35

Ok well heres the answer and explanation.

Answer 36

School laptops are so slow. Thats not it

Answer 37

At the end of two hours, the patient still has a 100% chance of survival. After three hours, he has an 85% of survival, or 0.85. After four hours, he has an 85% of the 85% he had at the end of three hours: 0.85 * 0.85 = 72.25% chance of survival.

Answer 38

Like what

Answer 39

oh

Answer 40

they were not clear at all with that

Answer 41

Here sother people explanation with it

Answer 42

The patient's chance of survival does not decrease as

100, 85, 70, 65, ...

but

100, 85, 72, 61, ..

In other words, each hour, the patient's chance of survival decreases by 15% of whatever it happens to be. You don't subtract 15 per hour, you multiply by .85 every hour.

Going ten hours after the initial two would make the patient's chance of survival .85 ^ 10, or 20%

Answer 43

Lol yes they were not

Answer 44

I guess that for people who gotta guess

Answer 45

So basically what it's saying is that:

100%

1st hour after 2 hr limit = 85% obviously

NOW HERES WHERE THEY DIDNT EXPLAIN IT

They say that it DECREASES BY 15% EACH HOUR

85% - 15% = .85 * .85

I understand that this is supposed to play mind games with you but wow I don't think many people would have noticed that.

Answer 46

Lol yeah. But .85*.85=15% or is it just because it loses its own 15% each hour

Answer 47

Yes this is a military test but practice test

Answer 48

Well thanks for helping me out!

Answer 49

0.85 * 0.85 = .7225 = 72.25%

Answer 50

That's good to know lol

Answer 51

O gosh. F for me . hah. Yes ok well i have to go now see you soon!