mean == sum of all observations / number of all observations
ex- heights of 5 bottles - 12,54,34,24,32 . find the mean?
mean= 12+54+34+24+32 / 5
= 156 / 5 =31.2
mean=31.2
- -1
In mathematics and statistics, the arithmetic mean ( /ˌærɪθˈmɛtɪk
In addition to mathematics and statistics, the arithmetic mean is used frequently in many diverse fields such as economics, anthropology, and history, and it is used in almost every academic field to some extent. For example, per capita income is the arithmetic average income of a nation's population.
While the arithmetic mean is often used to report central tendencies, it is not a robust statistic, meaning that it is greatly influenced by outliers (values that are very much larger or smaller than most of the values). Notably, for skewed distributions, such as the distribution of income for which a few people's incomes are substantially greater than most people's, the arithmetic mean may not coincide with one's notion of "middle", and robust statistics, such as the median, may be a better description of central tendency.
- 1
Sodium hydrogen carbonate or sodium bicarbonate (NaHCO3): It is commercially available as baking powder and is used in the baking food item like bread and bun. It is also used as an antacid which neutralizes the excessive acid in the stomach along with magnesium and aluminium hydroxide.
Sodium chloride (NaCl): It is the common salt and it is the main ingredient of food. Common salt is used in the preservation of food like to pack fish and meat during storage.
Ammonium chloride (NH4Cl): It is used in dry cell as an electrolyte.
Potassium nitrate (KNO3): It is used in the manufacture of glass and fertilizers. It is also the main constituent of gun powder.
Calcium carbonate (CaCO3): It is largely present in marbles. It is used in the preparation of glass and cement and also used in the extraction of iron from its ore in the form of slag (calcium silicate).
Copper sulphate (CuSO4): It is also known as "blue vitriol" and "blue stone". It is used in the copper voltmeter and in electroplating. It is used in the manufacture of insecticides and in calico printing.
Potash alum [K2SO4.Al2(SO4)3.24 H2O]: It is a double salt and is known as potassium aluminium sulphate. It is commonly used in the purification of water and in various industries like paper industry, dying industry, leather industry etc. It stops bleeding when applied on wound.
?
- 0