The span of a life.
In the days that this was coined that was considered to be seventy years.
Threescore used to be used for sixty, in the way that we still use a dozen for twelve, and (occasionally) score for twenty.
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The # 10 signifies Ordinal perfection. ref Companion Bible Appendix 10
The raw score is any value that is observed.
A "score" is 20. So 3 times 20 plus 10 = 70.
The z-score can't be calculated with the information given. A mean & standard deviation is required to put into the formula: Z = (x-mean)/sigma. Your x value is 10.
The number 10 signify completeness