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Filename: controllers/calculator.php

Line Number: 37

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Mean : We need to add up all the numbers and divide the answer by number of values in the data. Therefore

when we add we get = 78/12 = 6.5

Mean = 6.5

Range : We need find the lowest and the highest value of the data and then subtract them to get the range.

Range = 11

Median : We need to put the numbers in order and find the middle value. When we have even values we find

the mean of the 2 middle numbers

Median: 6.5

Mean : We need to add up all the numbers and divide the answer by number of values in the data. Therefore

when we add we get = 1970/5 = 394

Variance : Take difference of each value with mean, square the answers and find the average.

Value – mean : 206, -224, 76, -94, 36

Variances = 42436 + 50176+ 5776 + 8836+ 1296 = 108520/5 = 21704

Standard deviation : We need to find out standard deviation that will help measure how spread out numbers

are. We find the square root of the variance

√21704 = 147.32… = 147.