GMAT Question of the Day - Daily to your Mailbox; hard ones only

It is currently 16 Oct 2019, 10:10

Close

GMAT Club Daily Prep

Thank you for using the timer - this advanced tool can estimate your performance and suggest more practice questions. We have subscribed you to Daily Prep Questions via email.

Customized
for You

we will pick new questions that match your level based on your Timer History

Track
Your Progress

every week, we’ll send you an estimated GMAT score based on your performance

Practice
Pays

we will pick new questions that match your level based on your Timer History

Not interested in getting valuable practice questions and articles delivered to your email? No problem, unsubscribe here.

Close

Request Expert Reply

Confirm Cancel

Tony’s politicalscience final exam consists exclusively of 8 true/fals

  new topic post reply Question banks Downloads My Bookmarks Reviews Important topics  
Author Message
TAGS:

Hide Tags

Find Similar Topics 
Math Expert
User avatar
V
Joined: 02 Sep 2009
Posts: 58381
Tony’s politicalscience final exam consists exclusively of 8 true/fals  [#permalink]

Show Tags

New post 27 Feb 2019, 23:31
00:00
A
B
C
D
E

Difficulty:

  45% (medium)

Question Stats:

62% (02:06) correct 38% (01:38) wrong based on 29 sessions

HideShow timer Statistics

GMAT Club Legend
GMAT Club Legend
User avatar
D
Joined: 18 Aug 2017
Posts: 5008
Location: India
Concentration: Sustainability, Marketing
GPA: 4
WE: Marketing (Energy and Utilities)
GMAT ToolKit User Premium Member
Tony’s politicalscience final exam consists exclusively of 8 true/fals  [#permalink]

Show Tags

New post 28 Feb 2019, 04:34
Bunuel wrote:
Tony’s political science final exam consists exclusively of 8 true/false questions. If Tony guesses on every question, what is the probability that he gets exactly 7 questions right?

A. 1/32
B. 1/16
C. 1/8
D. 7/8
E. 31/32


each question being right or wrong 1/2
so 8 questions ; (1/2)^8
and 8 questions
so
(1/2^8) * 8 = 1/2^5 ; 1/32
IMO A

or
total possibilites = 2^8 = 256
and 8c7 ; 7 correct answers ; 8
so P = 8/ 256 = 1/32
IMO A
GMAT Club Bot
Tony’s politicalscience final exam consists exclusively of 8 true/fals   [#permalink] 28 Feb 2019, 04:34
Display posts from previous: Sort by

Tony’s politicalscience final exam consists exclusively of 8 true/fals

  new topic post reply Question banks Downloads My Bookmarks Reviews Important topics  





Powered by phpBB © phpBB Group | Emoji artwork provided by EmojiOne