A census collected data on everyone that lived in a certain small town. The random variable X is the number of girls born to a randomly selected couple in that town who has four children. Its probability distribution is shown below

x P(X=x) 0 0.0739 1 0.2664 2 0.3381 3 0.1748 4 0.1468

The one-standard-deviation interval is..................., ...............

the two-standard-deviation interval is.............., ....................

and the three-standard-deviation interval is

......................, ..............