The sample space of an experiment is changed when some additional information pertaining to the outcome of the experiment is received. The effect of such information is to reduce the sample space by excluding some outcomes as being impossible which before receiving the information were believed possible . The probabilities associated with such a reduced sample space are called conditional probabilities.

Knowing a student’s grade level does not help determine if he or she uses social media.

The given survey explains the conditional probability.

The students of the reduced sample space i.e. of 9th grade have the probability of 81% who use the social media.

The students of 8th grade that use social media can be greater or less than 81%.

Therefore this experiment does not help determine if he or she uses social media on the basis of his/her grade.

Only the last option is correct.

The conditional probability can be understood by the following.

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3 years ago

Which of the following shows the factors of 2y^2 - 2y - 4? Select one of the options below as your answer: A. (2y - 4)(y - 1) B.

yulyashka [42]

If you multiply out the answers, which is easier, then you can find the correct answer.

The factors need to multiply together to create the original problem, so it's just a matter of plug and chug.

The answer is B.

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4 years ago

Read 2 more answers

4) Which orde

dezoksy [38]

Answer:

Step-by-step explanation:

A is incorrect because: 2(6) -3(-4)<9 which is 24<9 which is not true

B is incorrect because: 2(-1) -3(-9)<9 which is 25<9 which is not true

C is incorrect because: 2(2) -3(-5)<9 which is 19<9 which is not true

D is correct because: 2(-3) -3(-3)<9 which is 3<9 which is true

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