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m_a_m_a [10]
3 years ago
6

Let's say you take a 10 question multiple choice test. Each question has 4 choices and you guess on all of them. What is the pro

bability you get 7 or more right?
Mathematics
2 answers:
AURORKA [14]3 years ago
5 0

In a multiple choice question the probability of success is :  p = 1/4 = 0.25

and the probability of failure is : q = 3/4 =) 0.75

r = 7 ( correct answers )

Probability =  10 C r * ( 1/4 ) ^(10- r) * ˙( 3/4 )^r =

=  10 C 7 * ( 0.25 )^3 * ( 0.75 )^7 = 

= 120* 0,00208568572 =

= 0,2502822864

<u>Answer: Probability is 0,2502822864 or 25.02822864 %.</u>

iren2701 [21]3 years ago
3 0

Answer:25%

Step-by-step explanation:

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