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The average age of a girl's first period is 12 to 13 (12.5 years in the United States, [6] 12.72 in Canada, [7] 12.9 in the UK [8]) but, in postmenarchal girls, about 80% of the cycles are anovulatory in the first year after menarche, which declines to 50% in the third year, and to 10% by the sixth. [9]
Infanticide (or infant homicide) is the intentional killing of infants or offspring. Infanticide was a widespread practice throughout human history that was mainly used to dispose of unwanted children, [1]: 61 its main purpose being the prevention of resources being spent on weak or disabled offspring.
In the United States, as of 2019, the median household income is $60,030 per year and the median household net worth is $97,300, while the mean household income is $89,930 per year and the mean household net worth is $692,100. [2] [3]
The status dropout rate reports the percentage of individuals in a given age range who are not in school and have not earned a high school diploma or equivalent credential. This rate focuses on an overall age group as opposed to individuals in the U.S. school system, so it can be used to study general population issues. [2]
Around 523,000 students between the ages of 15 and 24 drop out of high school each year, a rate of 4.7 percent as of October 2017. [45] In the United States, 75 percent of crimes are committed by high school dropouts. Around 60 percent of black dropouts end up spending time incarcerated. [46]
Rumspringa is a Pennsylvania German noun meaning "running around." It is a cognate of the Standard German verb rumspringen. [5] [6] Dialects do not derive from standard languages, but as a cognate, this expression is closely related to the Standard German verb (he)rumspringen meaning "to jump around or about."
A household's income can be calculated in various ways but the US Census as of 2009 measured it in the following manner: the income of every resident of that house that is over the age of 15, including pre-tax wages and salaries, along with any pre-tax personal business, investment, or other recurring sources of income, as well as any kind of governmental entitlement such as unemployment ...
The second quartile (Q 2) is the median of a data set; thus 50% of the data lies below this point. The third quartile (Q 3) is the 75th percentile where lowest 75% data is below this point. It is known as the upper quartile, as 75% of the data lies below this point. [1]