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.
Osteospermum is a low growing, spreading perennial, well suited to a number of uses. In particular it is a good flowering evergreen ground covering perennial that doesnât get too tall. They tolerate dry conditions well, and for this reason are often thought of as a plant only for dry soils.steospermums have been subject to hybridization and there is now a good colour range and a few interesting flower variations to the normal open daisy flowers which are their big draw. Osteospermum âWhirlygigâ being the most unusual of the flower shapes.