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

 It is currently 12 Dec 2018, 05:06

### 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

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

## Events & Promotions

###### Events & Promotions in December
PrevNext
SuMoTuWeThFrSa
2526272829301
2345678
9101112131415
16171819202122
23242526272829
303112345
Open Detailed Calendar
• ### The winning strategy for 700+ on the GMAT

December 13, 2018

December 13, 2018

08:00 AM PST

09:00 AM PST

What people who reach the high 700's do differently? We're going to share insights, tips and strategies from data we collected on over 50,000 students who used examPAL.
• ### GMATbuster's Weekly GMAT Quant Quiz, Tomorrow, Saturday at 9 AM PST

December 14, 2018

December 14, 2018

09:00 AM PST

10:00 AM PST

10 Questions will be posted on the forum and we will post a reply in this Topic with a link to each question. There are prizes for the winners.

# Tossing a coin, the probability of getting a head is 0.6. If

 post reply Question banks Downloads My Bookmarks Reviews Important topics
Author Message
Manager
Joined: 07 Dec 2006
Posts: 161
Tossing a coin, the probability of getting a head is 0.6. If  [#permalink]

### Show Tags

25 Jan 2008, 22:52
2
00:00

Difficulty:

(N/A)

Question Stats:

0% (00:00) correct 0% (00:00) wrong based on 4 sessions

### HideShow timer Statistics

Tossing a coin, the probability of getting a head is 0.6. If a coin is tossed for 5 times, what is the probability of getting at least 4 heads?

A. (0.6)^4 * 0.4
B. (0.6)^5
C. 0.8 * (0.6)^5
D. 2.6 * (0.6)^4
E. (0.4)^5 * 0.6

Could you please explain in detail?

--== Message from the GMAT Club Team ==--

THERE IS LIKELY A BETTER DISCUSSION OF THIS EXACT QUESTION.
This discussion does not meet community quality standards. It has been retired.

If you would like to discuss this question please re-post it in the respective forum. Thank you!

To review the GMAT Club's Forums Posting Guidelines, please follow these links: Quantitative | Verbal Please note - we may remove posts that do not follow our posting guidelines. Thank you.
CEO
Joined: 17 Nov 2007
Posts: 3440
Concentration: Entrepreneurship, Other
Schools: Chicago (Booth) - Class of 2011
GMAT 1: 750 Q50 V40
Re: PS - Prob. of tossing a coin  [#permalink]

### Show Tags

25 Jan 2008, 23:56
3
1
D

we use formula: $$p=C^n_m*q^{m}*(1-q)^{n-m}$$

$$p=C^5_4*(0.6)^4*(0.4)^1+C^5_5*(0.6)^5*(0.4)^0=(0.6)^4*(5*0.4+0.6)=2.6*(0.6)^4$$
_________________

HOT! GMAT TOOLKIT 2 (iOS) / GMAT TOOLKIT (Android) - The OFFICIAL GMAT CLUB PREP APP, a must-have app especially if you aim at 700+ | Limited GMAT/GRE Math tutoring in Chicago

Non-Human User
Joined: 09 Sep 2013
Posts: 9129
Re: Tossing a coin, the probability of getting a head is 0.6. If  [#permalink]

### Show Tags

08 Aug 2018, 08:04
Hello from the GMAT Club BumpBot!

Thanks to another GMAT Club member, I have just discovered this valuable topic, yet it had no discussion for over a year. I am now bumping it up - doing my job. I think you may find it valuable (esp those replies with Kudos).

Want to see all other topics I dig out? Follow me (click follow button on profile). You will receive a summary of all topics I bump in your profile area as well as via email.
_________________
Re: Tossing a coin, the probability of getting a head is 0.6. If &nbs [#permalink] 08 Aug 2018, 08:04
Display posts from previous: Sort by

# Tossing a coin, the probability of getting a head is 0.6. If

 post reply Question banks Downloads My Bookmarks Reviews Important topics

 Powered by phpBB © phpBB Group | Emoji artwork provided by EmojiOne Kindly note that the GMAT® test is a registered trademark of the Graduate Management Admission Council®, and this site has neither been reviewed nor endorsed by GMAC®.