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The ratio of width to height of standard-definition television. In mathematics, a ratio (/ ˈ r eɪ ʃ (i) oʊ /) shows how many times one number contains another. For example, if there are eight oranges and six lemons in a bowl of fruit, then the ratio of oranges to lemons is eight to six (that is, 8:6, which is equivalent to the ratio 4:3).
Proportion (mathematics) A proportion is a mathematical statement expressing equality of two ratios. [ 1][ 2] a and d are called extremes, b and c are called means . Proportion can be written as , where ratios are expressed as fractions . Such a proportion is known as geometrical proportion, [ 3] not to be confused with arithmetical proportion ...
t. e. A person's waist-to-height ratio ( WtHR ), occasionally written WtHR or called waist-to-stature ratio ( WSR ), is defined as their waist circumference divided by their height, both measured in the same units. It is used as a predictor of obesity-related cardiovascular disease. The WHtR is a measure of the distribution of body fat.
A sex ratio is the ratio of males to females in a population. As explained by Fisher's principle, for evolutionary reasons this is typically about 1:1 in species which reproduce sexually. [ 2][ 3] However, many species deviate from an even sex ratio, either periodically or permanently. Examples include parthenogenic species, periodically mating ...
The scale of a map is the ratio of a distance on the map to the corresponding distance on the ground. This simple concept is complicated by the curvature of the Earth 's surface, which forces scale to vary across a map. Because of this variation, the concept of scale becomes meaningful in two distinct ways.
Space. Θ ( n) [ 1] O ( n) A small phone book as a hash table. In computing, a hash table is a data structure often used to implement the map (a.k.a. dictionary or associative array) abstract data type. A hash table uses a hash function to compute an index, also called a hash code, into an array of buckets or slots, from which the desired value ...
The silver ratio is a Pisot–Vijayaraghavan number (PV number), as its conjugate 1 − √ 2 = −1 δS ≈ −0.41421 has absolute value less than 1. In fact it is the second smallest quadratic PV number after the golden ratio. This means the distance from δ n. S to the nearest integer is 1 δ n. S ≈ 0.41421n. Thus, the ...
The child sex ratio in India is defined as the number of females per thousand males in the age group 0–6 years in a human population. [ 1] Thus it is equal to 1000 x the reciprocal of the sex ratio ( ratio of males to females in a population) in the same age group, i.e. under age seven. An imbalance in this age group will extend to older age ...