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

Question

3 years ago

6

ment must be true?

2 answers:

liraira [26] · Answer 1 · 2022-08-12T22:41:36+03:00

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] · Answer 2 · 2022-08-12T23:43:53+03:00

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