What is the moving average ? for all 7 columns. Please guide me step by step. I'm not understanding moving average.

A Wrap Text General Copy Paste B I U A Merge & Center $ % .00 Format C34 X V fx A B C D E F G H Inbound_MKT Total_Sales Total_Quotes Total_Customers Calls_Ans_per_7.5hr_Day Outbound_Calls Same_Day_Close 20-Jan 311 43 205 30 14 169 22 20-Feb 285 40 178 29 13 157 20 20-Mar 287 40 183 28 12 160 20 20-Apr 267 36 169 25 12 148 18 20-May 266 37 167 26 12 157 18 20-Jun 276 37 175 26 13 155 18 10 00 20-Jul 298 39 189 28 13 163 20 20-Aug 293 39 177 28 12 171 19 10 20-Sep 277 33 169 24 13 144 16 11 20-Oct 307 34 184 26 13 155 17 12 20-Nov 260 32 162 24 12 134 16 13 20-Dec 256 32 160 24 12 134 15 14 21-Jan 308 37 204 27 13 156 19 15 21-Feb 315 38 212 28 14 155 19 16 21-Mar 300 33 197 24 14 138 17 17 21-Apr 310 35 210 26 14 147 17 18 21-May 284 38 186 28 13 151 19 19 21-Jun 320 35 204 27 15 164 18 20 21-Jul 351 39 231 29 15 173 19 21 21-Aug 345 39 219 30 15 172 19 22 21-Sep 313 34 199 26 15 154 17 23 21-Oct 331 39 210 29 14 163 19 24 21-Nov 280 31 157 23 11 132 15 25 21-Dec 256 32 161 22 12 131 14 26 27 28 29 30 31 32 33 34 35 36