If, by SX, is meant the sum of the scores, then the answer is 48/4 = 12
it is a bove the mean by 5 points
23
Assuming a normal distribution 68 % of the data samples will be with 1 standard deviation of the mean.
64.
n= 25 scores from a population with mean =20
The answer depends on what SAT tests. In the UK the mean is 100 and the SD approx 15 - the scores are truncated at 100 +/- 44.
The mean of a distribution of scores is the average.
yes. z score measures distance from 0. 0 represents the mean.
About 98% of the population.
The pattern is called a normal distribution, or a bell curve. It is characterized by symmetrical data points around the mean, with most scores clustering around the average and progressively fewer scores as you move away from the mean in either direction.
Can someone help me find the answer for a sample n=36 with a population mean of of 76 and a mean of 79.4 with a standard deviation of 18?
Adding all the scores and dividing by the number of scores yields the mean or average.