A population of middle school students contains 160 sixth graders, 180 seventh graders, and 140 eighth graders. Nine seventh gra
2 answers:
Answer: Second option is correct.
Step-by-step explanation:
Since we have given that
Number of sixth graders students = 160
Number of seventh graders students = 180
Number of eighth graders students = 140
If 9 seventh graders were part of a random sample of the population chosen to participate in a survey.
Let Number of sixth graders should be chosen be 'x'.
Since there will be direct proportion .
Hence, Second option is correct.
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The number of different ways that three speakers can be selected is 10 ways
Given the names of choice to be Ben, Will, Stewart, Hilary, and Kate. This means that we have a total of 5 name choices.
If the members of students activities are to select three speakers among these people, the number of ways this can be done is by using the combination rule as shown;
From the question, n = 5 and r = 3. On substituting
Hence the number of different ways that three speakers can be selected is 10 ways.
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