Code Example 5-2 var getAvg = function () { var count = 1; var itemTotal = 0; var item = 0; while (count < 4) { item = parseInt(prompt("Enter item cost: ")); itemTotal += item; count++; } var averageCost = parseInt(itemTotal/count); alert("Total cost: $" + itemTotal + ", Average cost: $" + averageCost); }; (Refer to Code Example 5-2) Suppose you tested the getAvg function by entering the values 5, 10, and 15 when prompted and the alert() method displayed Total cost: $30, Average cost: $7. What type of error is this?