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It then is 40000 to one significant figure
In statistics a significant number is a number that passes certain tests that makes the statistic relevant.
3. Any number that is not a 0 is a significant number. Rules for Significant Figures: 1. Non-zero numbers are always significant. (example: 1-9) 2. Zeroes between non-zeroes are always significant. (ex: the zero in 908 is significant) 3. All final zeroes to the far right of the decimal place are significant. (ex: the zeroes in 34.0 and 7.0 is significant) 4. Zeroes that act as place holders are not significant. (ex: the zeroes in 600 are not significant) 5. Zeroes before a decimal act as place holders and are not significant. (ex. the zero in 0.12 is not significant)
The two significant digits are 8 and 5. Leading 0s are place holders and are not significant.
Your question makes no sense. Significant is a word related to tests. The normal curve is a distribution, not a test.