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Llana [10]
3 years ago
14

On a multiple choice test with 13 questions, each question has four possible answers, one of which is correct. for students who

guess at all answers, find the standard deviation for the number of correct answers.
Mathematics
1 answer:
Scorpion4ik [409]3 years ago
4 0
Given:
n = 13, the number of questions
p = 1/4, probability of guessing a correct answer among 4 choices.
q = 3/4, probability of guessing an incorrect answer (q = 1 -p).

The problem is modeled by a binomial distribution.
The mean value is μ = np.
The standard deviation is √(npq).

For the given problem, the standard deviation is
√(13*(1/4)*(3/4)) = 1.561

Answer: 1.56 (nearest hunderdth)
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Marina86 [1]

Answer:

456 cm^{2}

Step-by-step explanation:

Find the height of the trapezoid first (QR):

\sqrt{37^{2} -35^{2} } = 12

QR = 12

Area:

\frac{a+b}{2} × h = \frac{35+41}{2} × 12

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5 0
2 years ago
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Snezhnost [94]
All so have to do is make sure to convert the negatives and positives of the second group of values since there is a subtraction symbol that you have to distribute to that section.

This would turn the expression into
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Then combine like terms and line all the values in order from greatest exponent value to least to get 
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4 years ago
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4 0
3 years ago
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