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3 years ago

13

4n-6m=-2;n=-2,-1,0 Solve for m

1 answer:

gregori [183]3 years ago

4 0

4n - 6m = -2

Let n = -2

4(-2) - 6m = -2

-8 - 6m = -2

-6m = -2 +8

-6m = 6

m = 6/-6

m = -1

So, when n is -2, m is -1.

Now, do the same when n is -1 and again when n is 0.

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Step-by-step explanation:

Here, the total number of T/F question = 10

The minimum answers needed correctly answered = 8

So, student needs to answer at least 8 questions correctly.

Here, the possibility of answering a question correctly = $(\frac{1}{2})$ = p = 0.5

Also, the possibility of answering a question wrong = $(\frac{1}{2})$ = q = 0.5

Now, to pass he needs to answer 8 or more ( 8 , 9 or 10) answers correctly.

P(answering 8 correct answer) = $^{10}C_8(p)^8(q)^2 = ^{10}C_8(0.5)^8(0.5)^2 = 0.0439$

P(answering 9 correct answer) = $^{10}C_9(p)^9(q)^1 = ^{10}C_9(0.5)^9(0.5)^1 = 0.0097$

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So, the total Probability = P(8) + P(9) + P(10)

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