Empirical Rule & Z-Score
Authored by Barbara White
Mathematics
9th - 12th Grade
Used 1+ times
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22 questions
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1.
MULTIPLE CHOICE QUESTION
1 min • 1 pt
In a normal distribution, what percent of the values lie above the mean?
13.5%
34%
50%
68%
2.
MULTIPLE CHOICE QUESTION
30 sec • 1 pt
In a normal distribution, what percent of the values lie within one standard deviation of the mean?
(from z = -1 to z = 1)
13.5%
34%
95%
68%
3.
MULTIPLE CHOICE QUESTION
1 min • 1 pt
2000 freshmen at State Univ. took a Biology test. The scores were distributed normally with μ=70 and σ=5.
What percent of scores are between 65 and 75?
34%
50%
68%
81.5%
4.
MULTIPLE CHOICE QUESTION
1 min • 1 pt
2000 freshmen at State Univ. took a Biology test. The scores were distributed normally with μ=70 and σ=5.
What percent of scores are less than 70?
34%
50%
16%
84%
5.
MULTIPLE CHOICE QUESTION
1 min • 1 pt
2000 freshmen at State Univ. took a Biology test. The scores were distributed normally with μ=70 and σ=5.
What percent of scores are greater than 75?
2.35%
2.5%
16%
13.5%
6.
MULTIPLE CHOICE QUESTION
1 min • 1 pt
2000 freshmen at State Univ. took a Biology test. The scores were distributed normally with μ=70 and σ=5.
Approximately how many students scored between 60 and 80?
95
100
1900
1950
7.
MULTIPLE CHOICE QUESTION
1 min • 1 pt
500 juniors at Central High School took the ACT last year. The scores were distributed normally with μ=24 and σ=4.
What ACT score is 3 standard deviations below the mean?
12
16
20
21
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