The formula for figuring this out would be:

$[(6\ choose\ 5)*0.2865^5*(1-0.2865)^{(6-5)}]+[(6\ choose\ 6)*0.2865^6*(1-0.2865)^{(6-6)}]\ =\ 0.00881661116\\$^{1}

http://bit.ly/2ss8JAh

You will notice that it is just the PDF formula for 5, and the PDF formula for 6 added together.

There are 3 ways to enter this in the calculator:

` ``(nCr(6,5)*0.2865^5*(1-0.2865)^(6-5))+(nCr(6,6)*0.2865^6*(1-0.2865)^(6-6)) -or- binomPdf(6,.2865,5)+binomPdf(6,.2865,6) -or- binomCdf(6,.2865,5,6)`

I have a questionand iam woundering if inspire cx cas can solve it ^

**Question:

Determine the likelihood that at least five of the six instruments will last at least 250 hours**^

This is how it should be solved. The error i get is syntax.

p(η≥5)=p(η=5)+p(η=6)=nCr(6,5)*(0.2865)^5*(1-0.2865)+(0.2865)^5 and the answer should be 0.00882

Would be awensome if someone could help me :)

Thanks everyone

]]>