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Andrei [34K]
2 years ago
6

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?
Mathematics
2 answers:
liraira [26]2 years ago
7 0
From all those aforementioned, the true statement is: Thanh’s grade is 2.5 standard deviations below the mean of the test grades. 
AVprozaik [17]2 years ago
5 0

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.

P(Z

=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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