braydenaddison738
11.09.2020 •
Mathematics
40% percent of what number is 34
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Ответ:
40% 34
100% x
crossmultiply now
40x=100*34
40x=3400 /:40 divide both sides by 40
x=3400:40
x=85 - its the answer
Ответ:
Option c -2.8571
Step-by-step explanation:
z-score are calculated as
We are given that mean=120 and standard deviation=S.D=35 as X~N(120,35).
Sample size=n=25.
We have to find z-score for x-bar=100. So,
z-score=[100-120]/[35/√25]
z-score=[-20]/[35/5]
z-score=-20/7
z-score=-2.8571.
Thus, the z-score associated with x-bar = 100 is -2.8571.