Question

The demand and forecast of an item for five months are given in the table.

Month Demand
Forecast
April
225
200
May
220 240
June 285 300
July 290 270
August 250 230

The Mean Absolute Percent Error (MAPE) in the forecast is ___________ % (round off to two decimal places)

Month Demand Forecast April 225 200 May 220 240 June 285 300 July 290 270 August 250 230

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Answer :

Correct answer is : 8.07

Period

Actual Demand

(Di)

Forecasted Demand

(Fi)

Absolute Percentage

Error

Ei = (Di - Fi)

April

225

200

25

May

220

240

-20

June

285

300

-15

July

290

270

20

August

250

230

20

Mean Absolute Percentage Error (MAPE) :

M A P E = i = 1 n | D i F i D i | n × 100

| 25 225 | + | 20 220 | + | 15 285 | + | 20 290 | + | 20 250 | 5 × 100 = 8.072 %

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