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den301095 [7]
3 years ago
9

g In a math test, each multiple choice question has 4 selections (only one of them is the correct answer). A correct answer will

earn 4 points and an incorrect is subject to 1 point deduction. What point is expected if a question is answered by random guessing
Mathematics
1 answer:
Ulleksa [173]3 years ago
3 0

Answer:

0.25

Step-by-step explanation:

Given that:

Number of options per question = 4

Number of correct answer per question = 1

Number of incorrect answers per question = 3

By random guess:

Probability of picking a correct answer :

Number of correct answers / number of options

= 1 / 4 = 0.25

Probability of picking an incorrect answer :

Number of incorrect answers / number of options

= 3/4

Hence,

X :______ 4 _____ - 1

P(X) : ___ 0.25 __ 0.75

Σ(X*P(x))

(4 * 0.25) + (-1 * 0.75)

1 + (-0.75)

1 - 0.75

= 0.25

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3 years ago
The safe load, L, of a wooden beam of width w, height h, and length l, supported at both ends, varies directly as the product of
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L ∝ \frac{w\times h^{2} }{l}

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