title: find average for multiple values in rows and columns in Excel
body: <p>I need a formula to find average for values if column value in 1:1 matches 15 and row value in A:A matches 750 for example, </p>
  
  <p>here is a screen shot for the table</p>
  
  <p><img src="https://i.stack.imgur.com/22iG1.jpg" alt="http://s17.postimg.org/twjqzdj5r/Untitled.jpg"></p>