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.

Answer:
The $Z$ -score for a test with a score of 70:

$Z = \frac{x - μ}{σ}$

$= \frac{70 - 70.4}{10}$

$= \frac{- 0.4}{10}$

$= - 0.04$
Therefore, required z-score $(z) = - 0.04$

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