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gogolik [260]
3 years ago
5

Consider this topic for a survey: How far do students at Alpha Elementary jump? Which of the following would lead to a biased sa

mple? Randomly choose several students from each grade to test. Test eight 6 th graders. Test the first 5 people listed on each class list. Test everybody in school.
Mathematics
1 answer:
Cloud [144]3 years ago
8 0

The correct answer is c. Biased samples are NOT random. If you choose a couple people from <em>each grade </em>therefor the answer is c.

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How many ways can we pick three distinct integers from {1, 2, ..., 15} such that their sum is divisible by 3?
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Answer:

Clearly from 1 to 15 we can only have the sum 6,9,12 and 15 to be divisible by 3.

Now meaning we have 4! ( 4 factorial) which implies 4x3x2x1= 24 .

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Step-by-step explanation:

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