Best Answer: Average is actually a range of scores, not just one number. The range of average is 85 to 115, low average to high average. An IQ test, if designed properly, should result in an average test score across the entire target population of 100 with a standard deviation of 10. So, the percentage of the target population scoring in each interval is as follows: 70 - 80: 2.1%. 80 - 90: 13.6%.
Typical concrete takes 28 days (4 weeks) to cure. Prior to the 28 days concrete still has moisture in it that weakens the strength of the concrete. If you seal it prior to 28 â¦ days there is a chance you will be sealing in some of that moisture and hence weakening the integrity of the concrete.hat depends on the concrete, as well as weather conditions, and the load the concrete would be subjected to. Concrete gains strength over time and the usual benchmarks are 7 â¦ days, and 28 days. At 28 days concrete has usually cured to nearly its maximum strength.
Poured Concrete. According to the Concrete Network, the majority of the cost of a concrete foundation is the concrete itself. The price of concrete varies by region, but as of 2008, it averaged around $75 per cubic yard, or just under $3 per cubic foot.