<PRE><B>Question 773189</B>
There are 30 students in the class. Each student has blank card. They all stopped to write a number between 1-5. Do u think its possible that 15/30 students will write the number 1 on their cards?
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Binomial problem with n = 30 and p(write a 1) = 1/5
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P(x = 15) = 30C15(1/5)^15*(4/5)^15 = binompdf(30,1/5,15) = 0.000179
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Very little chance that 15 of the 30 wrote the number 1.
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