stats Q pool 2
Quiz
•
Mathematics
•
12th Grade
•
Practice Problem
•
Hard
Standards-aligned
C Brown
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34 questions
Show all answers
1.
MULTIPLE CHOICE QUESTION
30 sec • 1 pt
The average running speed of a high school athlete is 15 mph with a standard deviation of 2 mph. Mike runs at 18 mph. What is Mike's z-score, and is his speed unusual? (In this case, assume unusual means more than 2 deviations above or below the mean)
z=1.5z = 1.5, not unusual
z=1.5z = 1.5, unusual
z=2.0z = 2.0, unusual
z=2.5z = 2.5, unusual
Tags
CCSS.HSS.ID.A.4
2.
MULTIPLE CHOICE QUESTION
30 sec • 1 pt
The average daily screen time for teenagers is 6.5 hours with a standard deviation of 1.2 hours. Jenny spends 9.4 hours on her phone daily. What is her z-score, and is it unusual? (In this case, assume unusual means more than 2 deviations above or below the mean)
z=2.42z = 2.42, unusual
z=2.50z = 2.50, unusual
z=2.25z = 2.25, not unusual
z=3.00z = 3.00, unusual
Tags
CCSS.HSS.ID.A.4
3.
MULTIPLE CHOICE QUESTION
30 sec • 1 pt
The mean weight of newborns is 7.5 pounds with a standard deviation of 1.1 pounds. A baby weighs 5.2 pounds. What is the z-score for this weight, and is it unusual? (In this case, assume unusual means more than 2 deviations above or below the mean)
z=-2.09z = -2.09, unusual
z=-1.91z = -1.91, not unusual
z=-2.10z = -2.10, unusual
z=-1.75z = -1.75, not unusual
Tags
CCSS.HSS.ID.A.4
4.
MULTIPLE CHOICE QUESTION
30 sec • 1 pt
A class has a mean test score of 80 and a standard deviation of 5. Lily scored 90 on the test. What is her z-score, and is her score unusual? (In this case, assume unusual means more than 2 deviations above or below the mean)
z=2.00, not unusual
z=1.80, not unusual
z=2.00, unusual
z=2.50, unusual
Tags
CCSS.HSS.ID.A.4
5.
MULTIPLE CHOICE QUESTION
30 sec • 1 pt
The average height for adult males is 70 inches with a standard deviation of 3 inches. If Mark is 76 inches tall, what is his z-score, and is it unusual? (In this case, assume unusual means more than 2 deviations above or below the mean)
z=2.0, unusual
z=2.5, unusual
z=1.5, not unusual
z=3.0, unusual
Tags
CCSS.HSS.ID.A.4
6.
MULTIPLE CHOICE QUESTION
30 sec • 1 pt
The average daily water consumption for a household is 250 gallons with a standard deviation of 30 gallons. The Smith family uses 310 gallons in a day. What is their z-score, and is it unusual? (In this case, assume unusual means more than 2 deviations above or below the mean)
z=2.00, not unusual
z=2.00, unusual
z=2.25, unusual
z=1.75, not unusual
Tags
CCSS.HSS.ID.A.4
7.
MULTIPLE CHOICE QUESTION
30 sec • 1 pt
The average temperature in a city during July is 85°F with a standard deviation of 4°F. One day, the temperature reaches 95°F. What is the z-score, and is it unusual? (In this case, assume unusual means more than 2 deviations above or below the mean)
z=2.25z = 2.25, unusual
z=2.50z = 2.50, unusual
z=2.00z = 2.00, not unusual
z=2.10z = 2.10, unusual
Tags
CCSS.HSS.ID.A.4
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