Question

A professor knows that her statistics students' final test scores have a mean of 75 and a standard deviation of 8.3. In her class, an "A" is any test score of 90 or higher. This quarter she has 26 students in her class. What is the probability that 3 students or more will score an "A" on the final test? Hint: You will need to use your knowledge of normal probability distributions to determine the probability of one individual getting an A and then use your knowledge of binomial distributions to determine the probability of 3 students or more out of 26 students getting an A.

          A professor knows that her statistics students' final
test scores have a mean of 75 and a standard deviation of 8.3.
In her class, an "A" is any test score of 90 or higher. This
quarter she has 26 students in her class. What is the probability
that 3 students or more will score an "A" on the final test?
Hint: You will need to use your knowledge of normal probability
distributions to determine the probability of one individual
getting an A and then use your knowledge of binomial distributions
to determine the probability of 3 students or more out of 26
students getting an A.

Added by Rocio D.

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