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.
Fast growing evergreen trees - 6' in 6-7 years starting with a 3 year seedling; Grows to 90' These evergreen trees like full sun; These evergreen trees do well in ordinary to poor soil - does equally well in limestone or acid soil; Can tolerate dry, rocky windy conditions; These evergreen trees are good for timber, Christmas trees and ornamental