In this chart, numbers are divided into two sections: low numbers and high numbers. Low numbers are typically from the lower half of the range of numbers while the high numbers are from the upper half of the range of numbers. Players may use these to balance their number selections to have a better chance of matching draw results.
High/Low Number
The graph below illustrates the distribution of high and low numbers over a selected period of draws. Each bar represents a single draw, with the lower portion of the bar indicating the count of low numbers (typically defined as numbers in the lower half of the number range), and the upper portion representing the count of high numbers (those in the upper half of the range). This visually compare the frequency and balance of high versus low numbers across multiple draws. The chart provides a clear view of both individual and cumulative trends, helping to identify patterns or biases in number distribution over time.
High/Low Number Summary
Below is a summary of the high-low number distribution which groups the draws based on the specific combinations of high and low numbers (e.g., 3 high and 2 low, 4 low and 1 high, etc.). This summary helps to highlight the most common high-low patterns observed over the selected period. This visually represent the distribution offering an at-a-glance view of the proportion of each high-low combination. The chart makes it easy to identify dominant patterns and assess how evenly the high and low numbers are distributed across all draws.
| High/Low | Draw Count | |||
|---|---|---|---|---|
| 6 : 1 |
|
5 | 6.76% | |
| 5 : 2 |
|
12 | 16.22% | |
| 4 : 3 |
|
20 | 27.03% | |
| 3 : 4 |
|
27 | 36.49% | |
| 2 : 5 |
|
9 | 12.16% | |
| 1 : 6 |
|
1 | 1.35% | |
Format Changes in Australia's Oz Lotto
Oz Lotto, Australia’s first national lottery, has undergone several format changes since its launch in 1994. Below is the timeline of the Australia's Oz lotto format changes:
| Period | Format | Supplementary Nos. |
|---|---|---|
| 1994 - Oct. 11, 2005 | 6 numbers from a pool of 45 (6/45) | 2 numbers from the same pool. |
| Oct. 18, 2005 - May 10, 2022 | 7 numbers from a pool of 45 (7/45) | 2 number from the same pool. |
| May 17, 2022 - Present | 7 numbers from a pool of 47 (7/47) | 3 number from the same pool |
Initially, the game required players to select six numbers from a pool of 45, and two supplementary numbers were drawn to help determine secondary prizes. In October 2005, the format was modified to increase the number of main numbers drawn from six to seven, still from a pool of 45, while retaining two supplementary numbers. This change made the jackpot more difficult to win but allowed for larger prize pools. In May 2022, Oz Lotto underwent another significant update. The number pool was increased from 45 to 47, while the game continued to draw seven main numbers. Additionally, the number of supplementary numbers increased from two to three. Along with this change, the minimum jackpot prize was raised from $2 million to $3 million, and the overall odds of winning any prize improved, creating more opportunities for players to win across additional prize divisions. These changes reflect Oz Lotto's ongoing efforts to remain engaging and competitive within Australia’s lottery landscape.
How Australia's Oz Lotto Format Changes Affect Your Number Strategy.
These 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 6/45 format may have done so due to higher individual draw probability, but that same frequency can be misleading in the 7/45 or 7/47 formats. Furthermore, changes to the number pool also significantly affect how often a specific supplementary numbers appear.
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.