Yes a Z score can be 5.
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z = (75 - 85)/5 = -10/5 = -2
When you don't have the population standard deviation, but do have the sample standard deviation. The Z score will be better to do as long as it is possible to do it.
The Z-score is just the score. The Z-test uses the Z-score to compare to the critical value. That is then used to establish if the null hypothesis is refused.
what is the z score for 0.75
Find the Z score that correspond to P25