Why are the four graphs in column(a) all centered at the sameplace?

All four graphs are centered at the same place because the mean of the samplingdistribution?

Is equal to? or? and normal distributions are centered

i Sampling distributions of the sample mean for (a) normal, (b) reverse-J-shaped, and (c) uniform variables X distribution of - X . X X the variable sampling distribution n = 2 sampling distribution n = 10 sampling distribution n = 30 (a) (b) (c) Print Done