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.
The genus Viburnum includes several species of blooming shrubs that grow well planted in a group or as a hedge for privacy. Viburnums generally produce dense, foliage-covered branches and clusters of white flowers in late spring, followed by small red or purple fruits attractive to birds.leanders (Nerium oleander) are broadleaf evergreen shrubs that grow in an upright, rounded form. They reach a mature height of about 8 feet and spread to about 5 feet, making them a good choice for a privacy hedge.