The grades of a science test are normally distributed. Thanh finds that his grade on the test has a z-score of –2.5. Which state
ment must be true?
2 answers:
From all those aforementioned, the true statement is: Thanh’s grade is 2.5 standard deviations below the mean of the test grades.
Answer:
Step-by-step explanation:
Given that the grades of a science test are normally distributed.
Also given that Thanh finds that his grade on the test has a z-score of –2.5
From this information we can find out the percentile of Thanh.

=1%
i.e. only 1% of the students were below Thanh grade and nearly 99% were above his grade
It is high time that Thann improves his scores as he is at 1st percentile only
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