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February 28, 2015

February 28, 2015

Posted by **rose** on Monday, November 23, 2009 at 5:03pm.

1. exactly 10 have pain caused by weak trunk muscles

2. more than 8 have pain caused by weak trunk muscles

3. fewer than 6 have pain caused by weak trunk muscles

- statistics -
**Reiny**, Monday, November 23, 2009 at 5:33pm1. Prob(pain caused by w.t.m.) = .8

prob(pain not caused by w.t.m.) = .2

so prob(exactly 10 caused by w.t.m.)

= C(15,10)(.8^10)(.2^5)

= .10318

2. lots of calculations here,

more than 8 means

exactly 9 + exactly 10 + exactly 11 + ...+ exactly 15

= C(15,9)(.8^9)(.2^6) + C(15,10)(.8^10)(.2^5) + ... + C(15,15)(.8^15)

2. done in a similar way, except you want

exactly 0 + exactly 1 + .. + exactly 5

= C(15,0)(.2)15 + C(15,1)(.8)(.2^14) + ..

happy calculating.

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