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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Let no red ribbons=x
no. Of blue ribbons=x+3
No. Of yellow ribb9ns=x+7
Totsl ribbons=28
28=x+x+3+x+7
28=3x+10
3x=28-10
3x=18
X=18/3
X=6
No .of red ribbons=6
No. Of blue ribbons=x+3=9
No. Of yellow ribbons=x+7=13
So the Pythagorean triplet is 8,15and 17
Answer:
an organism killing another organism for food
Answer:
(srt(3)/2, -1/2)
Step-by-step explanation:
x = rcos theta
r = 1 on unit circle
x = 1 cos (-pi/6)
x = sqrt(3)/2
y = r sin theta
y =1 sin (-pi/6)=
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10/16
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