Which expression compares the difference of the two means to this week’s mean absolute deviation?
StartFraction 0.8 over 0.7 EndFraction
StartFraction 2.7 over 0.7 EndFraction
StartFraction 0.8 over 0.5 EndFraction
StartFraction 2.7 over 0.5 EndFraction

Which of the following vectors are orthogonal to (2,1)? check all that apply

Exercise: counting committees 0.0/2.0 puntos (calificable) we start with a pool of n people. a chaired committee consists of k≥1 members, out of whom one member is designated as the chairperson. the expression k(nk) can be interpreted as the number of possible chaired committees with k members. this is because we have (nk) choices for the k members, and once the members are chosen, there are then k choices for the chairperson. thus, c=∑k=1nk(nk) is the total number of possible chaired committees of any size. find the value of c (as a function of n ) by thinking about a different way of forming a chaired committee: first choose the chairperson, then choose the other members of the committee. the answer is of the form c=(α+nβ)2γn+δ. what are the values of α , β , γ , and δ ?

What is the value of -3/4 to the 4th power? -256/81 -81/256 81/256 256/81