Question

question 16 (1 point)
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the mean absolute deviation (mad) for the forecasts shown in the following table is:

month	forecast demand	actual demand
may	175	200
june	190	200
july	240	220
august	225	195

more than 10 but less than or equal to 20.
more than 20 but less than or equal to 30.
more than 30 but less than or equal to 40.
more than 40 but less than or equal to 50.

Explanation:

Step1: Calculate absolute deviations

$|190 - 180|=10$, $|175 - 200| = 25$, $|190 - 200|=10$, $|240 - 220| = 20$, $|225 - 195|=30$

Step2: Sum absolute deviations

$10 + 25+10 + 20+30=95$

Step3: Calculate MAD

The number of data - points $n = 5$. MAD=$\frac{95}{5}=19$

Answer:

more than 10 but less than or equal to 20.