Refer to the accompanying figure. Complete parts (a) through (d) below. Click the icon to view the figure. a. Why are the four graphs in column (a) all centered at the same place? All four graphs are centered at the same place because the mean of the sampling distribution, is equal to and normal distributions are centered_/\\ Sampling distributions of the sample mean for (a) normal, (b) reverse-j-shaped, and (c) uniform variables I K |'| distribution of A I | | the variable X x x sampling distribution A i k )7 A )7 n = 2 sampling distribution /\\ \"=10 /\\ F a N | Sampling distributions of the sample mean for (a) normal, (b) reverse-j-shaped, and (c) uniform variables sampling distribution X X X n = 10 sampling distribution X X X n =30 (a) (b) (c)