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.
EVERGREEN TREE TYPES. In botany, an evergreen tree type or plant is a plant that has leaves in all seasons. This contrasts with deciduous tree type or plants, which completely lose their foliage during the winter or dry season. There are many different kinds of evergreen plants, both trees and shrubs. Evergreens include: most species of conifers (e.g., hemlock trees, blue spruce tree , red cedar, and white/scots/jack pine trees) live oak, holly, and ancient gymnosperms such as cycads.