
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
According to the classification standard of the Air Pollution Index (API) for city air quality, when the air pollution index is not greater than 100, the air quality is good. The environmental monitoring department of a city randomly selected the air pollution index for 5 days from last month's air quality data, and the data obtained were 90, 110, x, y, and 150. It is known that the average of the air pollution index for these 5 days is 110.
$(1)$ If x < y, from these 5 days, select 2 days, and find the probability that the air quality is good for both of these 2 days.
$(2)$ If 90 < x < 150, find the minimum value of the variance of the air pollution index for these 5 days.

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