1. Let X be a random variable with mean μ and variance σ . For a
∈ R, consider the expectation E ((X − a)2)
a) Write E((X −a)2) in terms of a,μ and σ2
b) For which value a is E ((X − a)2) minimal?
c) For the value a from part (b), what is E ((X − a)2)?
2. Suppose I have a group containing the following first- and
second-year university students from various countries. The first 3...