To develop a higher level of group skill, the person must be placed in the group operating one level above his or her present level of skills. why?

Because they can teach them to move up in that level of skill

Explanation:

If they have only one level of skill, they need people who have already finished that level to teach them to move higher.

when in a crucial situation, after calling 911, the correct posture for delivering effective compression is the proper hand placement.

first, place two fingers at the sternum, then put the heel of your other hand next to the fingers and place hand on top of the other. lock your elbows by using your body’s weight and compress the victim’s chest with a depth of 2 inches.

moreover, do 15 compression and 2 breaths, this process must be done four times until there is a pulse or a arrive.