Sound City sells the ClearTone-400 satellite car radio. For this radio, historical sales records over the last 100 weeks show 4
weeks with no radios sold, 33 weeks with one radio sold, 39 weeks with two radios sold, 12 weeks with three radios sold, 8 weeks with four radios sold, and 4 weeks with five radios sold. Calculate μx, σx2, and σx, of x, the number of ClearTone-400 radios sold at Sound City during a week, using the estimated probability distribution.
Kx-3y=k y=4x+1 ( we will put it in 1st equation ) kx - 3 (4x+1)=k kx - 12 x - 3 =k kx - 12 x = k+3 x(k-12) = k+3 x= Also y= We can not divide with zero. k-12=0 k=12 For k= 12 equations have no solutions.