Suppose that X has a X^2-distribution with 6 degrees of freedom.
a) What is the probability that an observation of X will exceed 6?
b) If 10 observations of X are made, so as to be independent, what is the probability that two or more of the observations will exceed 6?
The explanations are in the attached pdf file.
The formulae ...
A chi-squared distribution is analyzed. The solution is detailed and well presented.