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Scilla [17]
4 years ago
12

A test consists of 18

Mathematics
2 answers:
Dominik [7]4 years ago
6 0
A. True. about 10% because if you guess on every question you might not pass the test.
omeli [17]4 years ago
5 0
Number of questions = 18

Find each of the probability :
P(13 correct) = 18C13 (0.5)¹⁸ = 8568 / 262144
P(14 correct) = 18C14 (0.5)¹⁸ = 3060 / 262144
P(15 correct) = 18C15 (0.5)¹⁸ =   816 / 262144
P(16 correct) = 18C16 (0.5)¹⁸ =   153 / 262144
P(17 correct) = 18C17 (0.5)¹⁸ =     18 / 262144
P(18 correct) = 18C18 (0.5)¹⁸ =       1 / 262144

Find sum of the above probability : 
Find P( ≥ 13 correct) = ( 8568 + 3060 + 816 + 153 + 18 + 1) / 262144
Find P( ≥ 13 correct) =12616/262144
Find P( ≥ 13 correct) = 1577/32768
Find P( ≥ 13 correct) = 0.048

Answer: 0.048
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frutty [35]

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Step-by-step explanation:

I hope it is correct.

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Serhud [2]

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