A z-score of 70 would cover 35 standard deviations away from the mean. Note though, that a z-score of just 2.5 already covers 99% of the data. A z-score of 70 is incredibly high, and so is either a mistake, or will cover 100% of the data without fail. If a data point lies outside this, it is definitely an outlier and probably an error.
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zscore
7000
7000 - (0.06 * 7000) = 6580 or 7000 * (100-0.06) - 6580
21% of 7,000 = 21% * 7000 = 0.21 * 7000 = 1,470
37% of 7,000= 37% * 7000= 0.37 * 7000= 2,590