Wednesday

September 17, 2014

September 17, 2014

Posted by **deborah** on Friday, July 22, 2011 at 8:10pm.

- math -
**Damon**, Friday, July 22, 2011 at 8:26pmprob of visit = 1/5 = p = .2

Binomial dist:

p(x = 7) = [30:7] .2^7 (.8)^23

look up binomial coef [30:7]

or use formula

30!/[7!(23!)]

30!/23!/7! = 30*29*28*27*26*25*24/(7*6*5*4*3*2)

= 29*28*27*26*25*24/(7*6*4)

= 29*4*26*25 = 75,400

then

p = 75,400 (.2^7)(.8^23)

= .005697

- math -
**Reiny**, Friday, July 22, 2011 at 8:26pmprob to go Disney = 1/5

prob not to go Disney = 4/5

prob that 7 of 30 will go

= C(30,7)(1/5)^7 (4/5)^23 = appr. .1538

- math -
**Damon**, Friday, July 22, 2011 at 9:00pmbinomial coef error

coef = 2035800 not 75,400

30!/23!/7! = 30*29*28*27*26*25*24/(7*6*5*4*3*2)

2035800

p = 2035800 (.2^7)(.8^23)

= .1538

**Answer this Question**

**Related Questions**

algebra - In a large survey, it was discovered that 1 out of every 5 adults ...

math - Question: It was discovered that 1 outa every 5 selected adults visits ...

stats - This week we practice with Binomial Distribution. You can use Appendix ...

math - In a large population of adults, the mean IQ is 112 with a standard ...

MATH - In a study 42% of adults questioned reported that their health was ...

mATH - First graders who misbehave in school may be more likely to be regular ...

math statistics/probability - can anyone show me how to work this problem out ...

statistics - First graders who misbehave in school may be more likely to be ...

statistics - ) 43% of adults receive phone calls during the day. Amongst 10 ...

math - can anyone show me how to work this problem out thanks in advance The ...