Centuries: 9th century - 10th century - 11th century
Decades: 920s 930s 940s 950s 960s - 970s - 980s 990s 1000s 1010s 1020s
Years: 974 975 976 977 978 - 979 - 980 981 982 983 984
... This is a quincunx:
2. The name Sir Francis Galton gave to the machine he invented for demonstrating the normal distribution. Also known as the b ...
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