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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]
Generation Z (often shortened to Gen Z), also known as Zoomers, [1] [2] [3] is the demographic cohort succeeding Millennials and preceding Generation Alpha.Researchers and popular media use the mid-to-late 1990s as starting birth years and the early 2010s as ending birth years, with the generation most frequently being defined as people born from 1997 to 2012. [4]
Desserts like cakes, cookies, crumbles, and muffins; for bread recipes, experiment by swapping in up to 50 percent of the all-purpose flour for added nutritional value and flavor.
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]
Using their own definition of baby boomers as people born between 1946 and 1964 and U.S. census data, the Pew Research Center estimated 71.6 million boomers were in the United States as of 2019. [75] The age wave theory suggests an economic slowdown when the boomers started retiring during 2007–2009. [76]
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]
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 ...