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.
Excellent evergreen trees for landscape - good survival rate ; These evergreen trees require cool, sheltered moist location, well-drained soil; Restrictions limited as far as soil types and conditions; These evergreen trees are found in northern areas - from sea level to 6,000' The needles on these evergreen trees are 1/2 to 1 1/4 long - very fragrant, good color; These evergreen trees grow symmetrical and dense with a pyramidal crown ; These evergreen trees make excellent ornamental, Christmas tree or timber; Will not do well in heavy, wet clay soil