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Zu Chongzhi is known to have computed π to be between 3.1415926 and 3.1415927, which was correct to seven decimal places. He also gave two other approximations of π: π ≈ 22⁄7 and π ≈ 355⁄113, which are not as accurate as his decimal result.
As of July 2024, π has been calculated to 202 trillion decimal digits. The last 100 decimal digits of the latest world record computation are: [1] Graph showing how the record precision of numerical approximations to pi measured in decimal places (depicted on a logarithmic scale), evolved in human history.
Decimal to scientific First, move the decimal separator point sufficient places, n, to put the number's value within a desired range, between 1 and 10 for normalized notation. If the decimal was moved to the left, append × 10 n; to the right, × 10 −n.
In statistics, the 68–95–99.7 rule, also known as the empirical rule, and sometimes abbreviated 3sr, is a shorthand used to remember the percentage of values that lie within an interval estimate in a normal distribution: approximately 68%, 95%, and 99.7% of the values lie within one, two, and three standard deviations of the mean, respectively.
Health care cost as percent of GDP (total economy of a nation). [1] [2] Life expectancy vs healthcare spending of rich OECD countries. US average of $10,447 in 2018. [3] This article includes 2 lists of countries of the world and their total expenditure on health as a percent of gross domestic product (GDP).
This article includes a lists of countries and dependent territories sorted by their real gross domestic product growth rate; the rate of growth of the value of all final goods and services produced within a state in a given year. The figures are from the International Monetary Fund World Economic Outlook Database unless otherwise specified. [1]
World population. High, medium, and low projections of the future human world population [1] In world demographics, the world population is the total number of humans currently living. It was estimated by the United Nations to have exceeded eight billion in mid-November 2022.
AT&T Inc. is an American multinational telecommunications holding company headquartered at Whitacre Tower in Downtown Dallas, Texas. It is the world's third-largest telecommunications company by revenue and the second-largest wireless carrier in the United States.