A company has the information shown in the chart below regarding its forecast performance in the past three periods. 
What is the mean absolute deviation (MAD) ?
Definitions:
Discount Rate
In discounted cash flow analysis, it's the rate of interest used for calculating the present day value of future financial inflows.
Cash Flows
The sum of all money transactions both incoming and outgoing in an establishment, affecting its ability to maintain liquid resources.
Discounted Payback Period
The time required to recoup the cost of an investment taking the time value of money into account, effectively the period it takes for an investment's cash flows to cover its initial cost.
Cash Inflows
Money coming into a business from various sources, including sales, investment income, and financing activities.
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