Find probability to not fail if gets sixty percent correct
Imagine that a student takes a 20-item multiple choice exam. She didn't study, so all of her answers are guesses. Each item on the exam has five possible answers. What is the probability that she would not fail, i.e. she gets at least 60% correct?
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How many randomly selected adults must you survey if you want 99% confidence that the margin of error is two percentage points?
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Each item on the exam has five possible answers. What is the probability that she would not fail, i.e. she gets at least 60% correct?
Compute the standard error of the proportion. Calculate the z-statistic. What is the probability of obtaining this value of the z-statistic if the null hypothesis is true?
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Snowfalls occur randomly and independently over the course of winter. The average is one snowfall every 3 days. What is the probability of five snowfalls in 2 weeks?
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