
Statistics Review Normal Distribution
Authored by Barbara White
Mathematics
11th Grade - University

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15 questions
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1.
MULTIPLE CHOICE QUESTION
5 mins • 1 pt
The average number of calories in a 1.5-ounce chocolate bar is 225. Suppose that the distribution of calories is approximately normal with a σ of 10. Find the probability that a randomly selected chocolate bar will have between 200 and 220 calories.
2.
MULTIPLE CHOICE QUESTION
5 mins • 1 pt
Braking distance for car on a wet surface is normally distributed with a mean of 149 ft. and a standard deviation of 5.28 ft. Find the probability that the randomly picked car will have a breaking distance more than 160 feet.
0.4559
0.0186
0.2244
2.3
3.
MULTIPLE CHOICE QUESTION
5 mins • 1 pt
In a survey of men in the United States (ages 20-29), the mean height was 69.6 inches with a standard deviation of 3.0 inches. What height represents the first quartile? (i.e. the 1st 25% of data)
69.37 in
67.59 in
73.12 in
69.12 in
4.
MULTIPLE CHOICE QUESTION
5 mins • 1 pt
A z-score tells you...
5.
MULTIPLE CHOICE QUESTION
5 mins • 1 pt
At a local high school, GPAs are normally distributed with a mean of 2.9 and standard deviation of 0.6. What GPA boundary separates the students with the highest 2.5% of GPAs from the rest of the students?
3.9
4.1
4.2
4.0
6.
MULTIPLE CHOICE QUESTION
5 mins • 1 pt
Find the area under the standard normal curve between z = -2.55 and z = 1.08.
7.
MULTIPLE CHOICE QUESTION
5 mins • 1 pt
The mean temperature in Glens Falls for the month of February is 23 degrees with a standard deviation of 4.2 degrees. What is the z-score for a temperature of 17 degrees?
1.25
1.43
-1.43
-1.25
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