1000, 1020, 1040, 1060, 1080, and 1100
1111 is the only one.
1001, 1012, 1023, 1034, 1045, 1056, 1067, 1078, 1089, 1100
Mean average of 175, 550, 750 & 1100 (175+550+750+1100)/4 = 643.75
2100
1000, 1020, 1040, 1060, 1080, and 1100
26,200 - 1,100 = 25,100
There are uncountably infinitely many real numbers between 1080 and 1100. There are 21 integers between 1080 and 1100, including the "endpoints." They are: 1080, 1081, 1082, 1083, 1084, 1085, 1086, 1087, 1088, 1089, 1090, 1091, 1092, 1093, 1094, 1095, 1096, 1097, 1098, 1099, 1100.
1111 is the only one.
Since all the numbers in that range start with "11", there is really only one option!
8924 is the number that comes 1100 numbers after 7824.
1100
The numbers 1103, 1109, 1117, 1123, 1129, 1151, 1153, 1163, 1171, 1181, 1187 and 1193 are prime.
1100
There are seven: 1057, 1064, 1071, 1078, 1085, 1092, 1099.
1.1 is.
1001, 1012, 1023, 1034, 1045, 1056, 1067, 1078, 1089, 1100