When you measure a person's weight, you are measuring the
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Answer:
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.
You can set up this equation as:
Because remember, 70% is equal to 0.7 and x represents the unknown value. So, let's just solve it:
So, 70% of 120 is 84.
Because remember, 70% is equal to 0.7 and x represents the unknown value. So, let's just solve it:
So, 70% of 120 is 84.