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Illinois Lotto Statistical Trends - Mean, Standard Deviation, and Range

  Number Frequency   Extra Shot Frequency   Overdue Numbers   Odd/Even Numbers   High/Low Numbers   Sum and Root Sum   Hot and Cold Numbers   Most Common Pairs   Most Common Triplets   Most Common Quadruplets   Most Common Quintupletss   Mean, STDEV, and Range Trend   Quartile and Range Trend   Histogram of Means and Ranges
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  Number Frequency   Extra Shot Frequency   Overdue Numbers   Odd/Even Numbers   High/Low Numbers   Sum and Root Sum   Hot and Cold Numbers   Most Common Pairs   Most Common Triplets   Most Common Quadruplets   Most Common Quintupletss   Mean, STDEV, and Range Trend   Quartile and Range Trend   Histogram of Means and Ranges
 About Lotto

This chart displays the statistical trends of consecutive draws, showing how the mean, standard deviation, and range of numbers drawn vary over time. This illustrate the variability and distribution patterns inherent in random lottery results.

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Last 75 draws
From Feb. 24, 2025 To Aug. 16, 2025

Mean, Standard Deviation (STDEV), and Range Trend

The chart below presents the statistical trends of Lotto lotto combinations from Feb. 24, 2025 to Aug. 16, 2025 , covering 75 draws by tracking the mean, standard deviation, and range.

The Mean line indicates the average drawn number per draw, the Standard Deviation (STDEV) line shows how widely spread the numbers in each draw are from their respective mean, and the Range line, calculated as the difference between the highest and lowest number in each draw, shows the gap between the highest and lowest numbers drawn.

Together, these statistics and their trends offer a clearer picture of the variability inherent in lotto draws, though they do not imply predictability, as true lottery systems are designed to be random. It helps to observe whether the statistical properties of the drawn numbers exhibit any pattern, volatility, or clustering over time.

Mean
Standard Deviation
Range

Statistical Analysis

The Mean remains relatively stable, with no clear long-term shift towards higher or lower averages. Overall, the mean values fluctuate significantly throughout the dataset, reflecting the randomness expected in lottery outcomes.

Average Mean
26.91
Highest Mean
40.17
Lowest Mean
15.83
Mean Trend
Decreasing

The Standard Deviation (STDEV) shows the values remain relatively stable, showing a consistent mix of tightly grouped and more spread-out draws. In general, the standard deviation values fluctuate significantly across the dataset.

Average STDEV
12.7
Highest STDEV
18.49
Lowest STDEV
5.39
STDEV Trend
Increasing

The Range remains generally stable, with fluctuations that balance out over time. Overall, the range values fluctuate significantly across the dataset, highlighting variations in the spread of drawn numbers.

Average Range
35.59
Highest Range
48.00
Lowest Range
16.00
Range Trend
Increasing

Format Changes in Illinois Lotto

The Illinois Lotto has undergone several format changes below since its launch to enhance gameplay:

Period Format Extra Shot
February 19, 1983 6/40 None
May 13, 1984 6/44 None
April 15, 1990 6/54 None
October 28, 1998 6/52 None
November 4, 2012 6/52 1/25
September 2021 6/50 1/25

How Illinois Lotto Format Changes Affect Your Number Strategy.

The format changes have a direct impact on statistical analysis. Mixing frequency data across different formats is not advisable because each version of the game has a different number pool and probability structure.

For example, a number that appeared frequently in the 6/50 format may have done so due to higher individual draw probability, but that same frequency can be misleading in the 6/52 and 6/54 format.

Therefore, for meaningful analysis, it’s essential to treat each format as its own distinct dataset. Analyzing trends or frequencies should be restricted to results from within the same format period, especially if the goal is to inform number selection in the current game structure.

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