Answer:
The $ Z $-score for a test with a score of 70:
$ Z = \frac{x – \mu}{\sigma} $
$ = \frac{70 – 70.4}{10} $
$ = \frac{-0.4}{10} $
$ = -0.04 $
Therefore, required z-score $(z) = -0.04 $
Ms. Kristi’s Math Class took their first test. The average of the test was 70.4 with a standard deviation of 10. What Z-score does a test with a score of 70 have?Z = __ Round the answer to nearest 100th.
