Refer to the following prompt for the questions 1-2:
The bear alarm at Grizzly's Peak ski resort sounds an average of once every thirty days, but the alarm is so sensitively calibrated that it sounds an average of ten false alarms for every undetected bear. Despite this, the alarm only sounds for three out of four bears that actually appear at the resort.
1. If the alarm sounds, what is the probability that a bear has actually been sighted.
(A) 1/4
(B) 3/13
(C) 27/52
(D) 3/4
(E) 10/13
2. On any given day at the resort, what is the approximate probability that there is neither an alarm nor an undetectable bear.
(A) 224/365
(B) 13/14
(C) 14/15
(D) 376/390
(E) 29/30
Please provide explanation of your answer so as to help other members.
Source: Veritas Prep
[spoiler]OA: After some discussions[/spoiler]
Two more questions in the sequel and with the same prompt: https://www.beatthegmat.com/the-bear-ala ... 63006.html
Target Test Prep's 2024 GMAT Focus Edition prep is discounted for the BTG community!
Redeem5-Day Free Trial
5-day free, full-access trial TTP
Available with Beat the GMAT members only code
MORE DETAILSThis topic has expert replies
The bear alarm at Grizzly's Peak ski resort sounds -- Seq#1
by
magpie16 » Fri Jun 07, 2013 7:28 pm
• Page 1 of 1
5/5
5 Star (486 Reviews)
"Target Test Prep is the closest to the official version of the GMAT exam, about 99% accuracy in terms of the quality and quantity of information. The course has excellently created singular sets of focused lessons and tests for every possible topic that one could come across in the official GMAT exam."
"The TTP course maximizes the efficiency of the time you spend studying. It will take time and effort but I could almost guarantee that if you complete the course exactly as it is laid out you will get an amazing score. They also have a very responsive team willing to help with any questions you might have."
"TTP has two things that I think no other test prep company offers: A teaching approach that reinforces understanding and an attitude that will give you the mental preparedness needed to succeed on the test. TTP gives you a deep understanding of the concept you need to know while teaching you how to think."
GMAT Course Reviews
Admissions Consulting Reviews
FREE GMAT PREP RESOURCES
GMAT PREP DEAL TRACKER
- ONLY $85
- SAVE $300
- ONLY $99
- $150 OFF
- 50% OFF
- SAVE $75
- 100% OFF