When analysing normally distributed data, standard deviation can be used in conjunction with the mean in order to calculate data intervals. If = mean, S = standard deviation and x = a value in the data set, then. 1  about 68% of the data lie in the interval: . 2  about 95% of the data lie in the interval: + 2S.
Little gem arborvitae (Thuja occidentals 'Little Gem') is an evergreen shrub that keeps its brilliant color and foliage all year long. Growing 1 to 3 feet tall, little gem has medium texture and a slow growth rate. The dense dwarf shrub has a compact form and globose shape.
Depending upon conditions, this dwarf tree may grow up to 35 feet, although a more typical size of a mature tree is a height of 15 feet and a spread of 7 to 10 feet.ittle Gem magnolia (Magnolia grandiflora Little Gem), a compact evergreen tree, is a slow-grower but can sport flowers when it's only 2 to 3 years old. Also known as the dwarf Southern magnolia, this tree works well for smaller yards and in lawns, near decks and patios, in planters or as a privacy screen or hedge.