The T-Score Formula. The t-score is a fraction. The numerator is the sample's mean minus mean of the group you are comparing the sample to, and the denominator is the sample's standard deviation divided by the square root of the sample size.
If you have smoked marijuana then the drug will stay for 3 to 30 days. This is normal for the common drugs. But in the case of marijuana, this can be detected even after a month in Urine drug test marijuana. Marijuana will stay in your system for 10 days if you have been smoking occasionally.
Rating Newest Oldest. Best Answer: THC (Tetrahydrocannabinol) can stay in a person's body for as long as 3 to 90 days after smoking or being ingested orally.arijuana stays in your system for different amounts of time depending on how often you smoke it, how much you smoke, and the makeup of the individual (weight/height/etc.). Source(s): http://www.marijuanapassion.com/How-Long... snockey23 Â· 10 years ago.