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 magnolias produce large, creamy white blooms. The Southern magnolia (Magnolia grandiflora) is a large tree that grows 20 to 80 feet in height. The smaller version is âLittle Gem,â which reaches heights of 20 to 25 feet.ach of these evergreen magnolia trees are grown in full sun to partial shade in Sunsetâs Climate Zones 4 to 12 and 14 through 24. Evergreen magnolia trees retain their leaves throughout the winter. A frost can damage the remaining leaves and kill foliage and limbs if the temperatures are unusually cold.