The z-score for an observation (or a set of them) can only be calculated if the mean and standard deviation are known. Neither of them are given in this question.
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zscore
percent of change from 125 to 135 = 8%% change =|original value - new value|/original value * 100%= |125 - 135|/125 * 100%= 10/125 * 100%= 0.08 * 100%= 8%
The value of the 1 is 100. The value of the 2 is 20. The value of the 5 is 5.
1683
It is a cubic polynomial in x and its value depends on the value of x.