Icons Retina Display 76x76 and 152x152

Getting Started Newbie Questions
#1

Which is the resolution of 76x76 and 152x152 icons used in iOS 7?

72 DPI?

#2

76 pixels by 76 pixels  and 152 pixels by 152 pixels.   DPI really doesn’t matter, but make it 72 to be safe.

#3

Ok. Thanks.

#4

76 pixels by 76 pixels  and 152 pixels by 152 pixels.   DPI really doesn’t matter, but make it 72 to be safe.

#5

Ok. Thanks.