Mean, Variance, Standard Deviation, and Expectation!

[ms_kris1993]

I have a question about how to do the second part of this problem because I have already found the first part.

What is the probability that they will sell 6 or more contacts three days in a row?
X 4 5 6 8 10
-----------------------------------
P(X) 0.4 0.3 0.1 0.15 0.05

 

[tkhunny]

p(six or more) = p(6) + p(8) + p(10) = R

Calculate \(\displaystyle R^{3}\)