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.
Golden Male Fernâ Semi-evergreen hardy fern, producing a âshuttlecockâ of dark green lance shaped fronds, Height 60cm best grown in moist humus rich soil in partial shade. DRYOPTERIS Atrata â Shaggy Shield Fern. The clump-forming Shaggy shield fern has large, dark green fronds that unfurl to resemble elephantsâ trunks.ryopteris can be deciduous, semi-evergreen or evergreen ferns, with stout, erect or decumbent rhizomes and shuttlecock-like rosettes of lance-shaped to ovate, pinnately divided fronds. Semi-evergreen fern to 75cm, forming a compact clump of broadly ovate, bipinnatifid fronds, often coppery-pink when young.