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  2. Household income in the United States - Wikipedia

    en.wikipedia.org/wiki/Household_income_in_the...

    In the case of mean income, the income of all households is divided by the number of all households. [33] The mean income is more affected by the relatively unequal distribution of income which tilts towards the top. [34] As a result, the mean income in the United States is higher than the median income, with the top earning households boosting it.

  3. Standard deviation - Wikipedia

    en.wikipedia.org/wiki/Standard_deviation

    Example of samples from two populations with the same mean but different standard deviations. Red population has mean 100 and SD 10; blue population has mean 100 and SD 50. A large standard deviation indicates that the data points can spread far from the mean and a small standard deviation indicates that they are clustered closely around the mean.

  4. IQ classification - Wikipedia

    en.wikipedia.org/wiki/IQ_classification

    An IQ score of 115 means performance one standard deviation above the mean, while a score of 85 means performance one standard deviation below the mean, and so on. [5] This "deviation IQ" method is now used for standard scoring of all IQ tests in large part because they allow a consistent definition of IQ for both children and adults.

  5. 50–40–90 club - Wikipedia

    en.wikipedia.org/wiki/50–40–90_club

    During his second stint with the Phoenix Suns, Steve Nash achieved the 50-40-90 feat in four separate seasons, the most of any player.. The 50–40–90 club is a statistical achievement used to distinguish players as excellent shooters in the National Basketball Association (NBA), NBA G League, Women's National Basketball Association (WNBA), and men's college basketball.

  6. Penetrance - Wikipedia

    en.wikipedia.org/wiki/Penetrance

    If 100% of individuals carrying a particular genotype express the associated trait, the genotype is said to show complete penetrance. [1] Neurofibromatosis type 1 (NF1), is an autosomal dominant condition which shows complete penetrance, consequently everyone who inherits the disease-causing variant of this gene will develop some degree of symptoms for NF1.

  7. Majority - Wikipedia

    en.wikipedia.org/wiki/Majority

    For example, say a board has 7 members. "Majority" means "at least 4" in this case (more than half of 7, which is 3.5). But 50% + 1 is 4.5, and since a number of people can only be integer, "at least 50% + 1" would mean "at least 5". An example of the expression's misuse to refer to a majority is the 50+1 rule.

  8. Confidence interval - Wikipedia

    en.wikipedia.org/wiki/Confidence_interval

    Each row of points is a sample from the same normal distribution. The colored lines are 50% confidence intervals for the mean, μ. At the center of each interval is the sample mean, marked with a diamond. The blue intervals contain the population mean, and the red ones do not.

  9. Grade (slope) - Wikipedia

    en.wikipedia.org/wiki/Grade_(slope)

    This is not the usual way to specify slope; this nonstandard expression follows the sine function rather than the tangent function, so it calls a 45 degree slope a 71 percent grade instead of a 100 percent. But in practice the usual way to calculate slope is to measure the distance along the slope and the vertical rise, and calculate the ...