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1 answer:
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Answer:
The result for this equation is .
Step-by-step explanation:
-Solve:
-Multiply and
by
:
-Reduce to the lowest term by extracting and canceling out 3:
-So, the result is .
Answer:
The proportion of exam scores that are lower than Irina's score is 0.9938
Step-by-step explanation:
<u>Data</u>
- mean: 80 points
- standard deviation (sd): 6 points
- value of interest (x): 95 points
z-score is computed as follows:
z = (x - mean)/sd
z = (95 - 80)/6 = 2.5
We want to find:
P(z < 2.5)
From the table attached:
P(z < 2.5) = 0.9938
