Refer to the exhibit. If the Z-score for this rule is greater than or equal to three, what does this mean?

Question

Exhibit

Options

• AThe rate of firewall connection is below historical average value.
• BThe rate of firewall connection is optimum.
• CThe rate firewall connection is above the historical average value.
• DThe rate of firewall connection is above the current average value.

• A
  3% (1)
• B
  5% (2)
• C
  82% (31)
• D
  11% (4)

Explanation

The Z-score formula in the expression builder calculates how many standard deviations the current value is from the historical average. The formula used is: AVG(Firewall Session) represents the current firewall session rate. STAT_AVG(AVG(Firewall Session);112) represents the historical average over a 112-time unit STAT_STDDEV(AVG(Firewall Session);112) represents the historical standard deviation over the A Z-score 3 indicates that the current firewall session rate is significantly higher than the historical average (3 standard deviations above the mean), signaling an anomaly.

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