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Gekata [30.6K]
2 years ago
9

A multiple-choice test consists of 10 questions. Each question has answer choices of a ,b c, d ,e , and , and only one of the ch

oices is correct. If a student randomly guesses on each question, what is the probability that he gets at least 2 of them correct?
Mathematics
1 answer:
aalyn [17]2 years ago
4 0
Its easier to find the complement of that instead
so you find the probability of 1 and 0
The .2 in the answer is the probability of each question 1/5
  (10 C 0) x .2^0 (1-.2)^10-0=.1074
 (10 C 1) x .2^1 (1-.2)^10-1=.2684
.2684+.1074=.3758 and that's the complement
so 1 - .3758= .6242
I too have a stats exam on this tomorrow lol
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use the eqn below to find the mid-pts

x-mid-pt = (x₁+x₂)/2

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So

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midpoint LM = (5+⁻3/2, ⁻1+⁻1/2) = (1,-1)

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Distance between JK and LM = √(0⁻1)² + (2 - ⁻1)² = √1 + 9 = √10

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Scale is 10

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8 0
3 years ago
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