JSFiddle - React, Tailwind, and code Playground

JavaScript

var temperatures = new Array();

temperatures["monday"] = 23.5;
temperatures["tuesday"] = 22.3;
temperatures["wednesday"] = 28.5;
temperatures["thursday"] = 23.5;
temperatures["friday"] = 22.3;
temperatures["saturday"] = 28.5;
temperatures["sunday"] = 29.5;
var count=0,total=0;
for(t in temperatures)
{
    total = total+temperatures[t]
    count++;
}
alert(total/count);