ben has 8 rows of math problem to answer each row has 5 problems. how many problems dose ben have to answer?
2 answers:
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Answer:
Probability of getting at least 9 out of 18 correctly is 0.0043
Step-by-step explanation:
We have
n = 18
p = 1/5 for correct answer
q = 4/5 for wrong answer
P( 9 X
18) = 1 - P(0
X
8)
= 1 - 0.9957
=0.0043