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.
Tall upright junipers make good windbreaks, large hedges and striking accents in the landscape. Hetzii Columnaris (Juniperus chinensis Hetzii Columnaris) is a vigorously growing juniper, reaching 10 to 15 feet tall and 5 feet wide at maturity.heir foliage can be dark green, light green, silver-blue or have golden hues. The types of juniper shrubs include low, ground-hugging forms, medium-sized shrubs and large, pyramidal forms. Use low-growing junipers as evergreen ground covers and medium or large shrubs as hedges, screens, windbreaks and specimen plants.