A set of physics exam scores are normally distributed with a mean of 80 points and a standard deviation of 6
1 answer:
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
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Answer:
2.5 gallons
Step-by-step explanation:
Make the denominators of the fractions the same and combine them
Then simplify the fraction
Then subtract how many gallons you have from how many you want
You will need 2.5 gallons to make 3 gallons