Monday

January 26, 2015

January 26, 2015

Posted by **Christine** on Wednesday, May 14, 2008 at 5:16pm.

I thought this was pretty easy but I cannot figure it out!

- Statistics -
**drwls**, Wednesday, May 14, 2008 at 5:31pmYou need to add the probabilities of getting 8,9,10,11,12,13,14,15 and 16 right

The probability of getting 8 right (and 8 wrong) is

(0.2)^8*(0.8)^8*[16!/(8!*8!)]= 0.00553

The probability of getting 9 right (and 7 wrong) is

(0.2)^9*(0.8)^7*[16!/(7!*9!)]= 0.00122

etc. The probability of getting higher numbers right drops off very fast

The probability of getting 16 right is (0.2)^16 = 7*10^-12 (i.e negligible)

- Statistics -
**jake**, Tuesday, April 19, 2011 at 9:13pm.0069

**Answer this Question**

**Related Questions**

statistics - A multiple choice exam has 20 questions; there are four choices for...

stats - a student randomly guesses at five multiple-choice questions, each ...

advanced statistics - suppose a student takes a multiple choice test with 10 ...

Statistics - A student makes random guesses on 6 multiple-choice questions. One ...

Stats - A student takes a 32 question multiple choice exam but did not study and...

statistics - A student is taking a multiple choice exam. There are five possible...

statistics - A student is taking a multiple choice test where each question have...

statistics - 10. A student is taking a multiple choice test where each question ...

Statistics - A student is taking a true/false exam with 15 questions. If he ...

Math - 10 multiple choice questions each with three possible answers only one of...