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eimsori [14]
3 years ago
5

If a student was randomly guessing while completing a 20 question multiple choice exam, what is the probability they would score

a 50% or higher
Mathematics
1 answer:
mario62 [17]3 years ago
7 0

Answer:

you want 4 correct and 16 incorrect

there are 20 questions

each question has four answers, so

P(right answer) = 1/4

P(wrong answer) = 3/4

----

Since you want 4 correct of 20 we have a combination of 20C4

This is a binomial problem where p = 1/4, q = 3/4 and we get

(20 "choose" 4)*(probability correct)^(number correct)*(probability incorrect)^(number incorrect)

putting numbers in we get

(20c4)*(1/4)^4*(3/4)^16

This gives us

~ .189685

Step-by-step explanation:

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solniwko [45]

Answer:

Cost = 112.266 cent/km

Step-by-step explanation:

Given

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Required

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This is calculated using:

Cost = Unit\ cost * Rate

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2 years ago
-9+8k=7+4k(if there is no solution,type in ''no solution'') k= Answer
Shtirlitz [24]

Answer:

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Step-by-step explanation:

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Subtract 4k from each side

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k = 4

Plug in the value you got for k:

-9 + 8(4)  ?  7 + 4(4)

-9 + 32  ?  7 + 16

23  ? 23

23 = 23

4 0
3 years ago
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