It has to be B since it shoes both boys and girls.
Option 1:
<span>Measuring the heights of every fiftieth person on the school roster to determine the average heights of the boys in the school
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Comment: this might not be a good idea for fairness as we only wish to determine average height of the boys. Taking a group of 50 people randomly, might not give us the same number of boys every time.
Option 2:
<span>Calling every third person on the soccer team’s roster to determine how many of the team members have completed their fundraising assignment
Comment: The context doesn't seem to need a sampling. The number of players in a soccer team is considerably small. We can find exact data by asking in person.
Option 3:
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Observing every person walking down Main Street at 5 p.m. one evening to determine the percentage of people who wear glasses
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Comment: To get a more accurate result and fairer sampling, the period of observing could have been longer, for example, observing for 12 hours on that day, or an alternative is to observe at 5 pm for 7 days in a row. It could happen that no one walking down the Main street precisely at 5 pm wears glasses, or it could happen the other way around.
Option 4:
<span>Sending a confidential e-mail survey to every one-hundredth parent in the school district to determine the overall satisfaction of the residents of the town taking a poll in the lunch room (where all students currently have to eat lunch) to determine the number of students who want to be able to leave campus during lunch.
Comment: This sampling does fairly represent the population, although it might be an idea to scale down the sample population, i.e. every fiftieth parent.
Answer: Option 4</span>
C 1:3 it you multiply both numbers by 2 you will have 2:6. 1:3 is just simplified
Answer: 21 questions
Step-by-step explanation:
Turn it into a number sentence.
72% of x amount of questions is 15
0.72(x) = 15. Divide both sides by 0.72
x= 20.83333 round to nearest whole number
x= 21 questions
Step-by-step explanation:
2x+3y=23 2x+3.7=23 2×1 + 3×7 = 23
3y= 23 2×+21= 23 2 + 21 = 23
23÷3 = 7 2x= 23-21
y=7 2x= 2
x= 1
5x+3y=17 5×4+3y=17
5x=17+3 20+3y=17
5×=20 20=17+3y
14÷5 = 4 20=20+y
x=4 y=20-20
y=0
