University:
College
Course:
College Mathematics
Academic year:

2023
Views:

186

Pages:

1
Author:

Sergio P.

Date :Variability Mathematicwhe have discussed the averages and the means of sets of values.while the mcon is a ureful tool in describing a characteristicof a set of numbers, sometimes it is valuable to obtain (information about the man. There is a second number thatindicates how representative the mean is of the data. For examplein the grouph of numbers, 100, 5, 20, 2 the mean is31. 75. IF these data points represent tank levels For fourdays , the use of the man level, 31. 75, to make adecision using tank usage could be misleading because noneof the data points was close to the man. Thisspread or distance, of each data point from themean is called the variance The Variance of each data pointis calculated by:Voriance X,whereX, = each data point: meanThe varience of each data point does not provide USwith any ureful information But if the mean of theVariances is calculated, a very useful number is detarminedThe madn variance is the average value of the variencesof a set of data. The mean variance is calculated 95Follow:nMean Variance - -E/x,-x/n i=1CSDipindai dengan CamScanner