
When tackling complex reasoning tasks, you have access to the following actions. Use them as needed to progress through your thought process.

[ASSESS]

[ADVANCE]

[VERIFY]

[SIMPLIFY]

[SYNTHESIZE]

[PIVOT]

[OUTPUT]

You should strictly follow the format below:

[ACTION NAME]

# Your action step 1

# Your action step 2

# Your action step 3

...

Next action: [NEXT ACTION NAME]


system
Given the price of strawberries (unit: yuan per kilogram) x takes the values of 12, 16, 20, 24, and 28, and the market demand (unit: hundred kilograms) y is given by y=-0.5x+20, calculate the variance of the market demand.

Present the answer in LaTex format: \boxed{Your answer}
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