If the grades on a statistics test are normally distributed with a mean of 80 and a standard deviation of 5, a. What is the probability that a randomly selected student received a 70 or below? Ans. b. What grade would you have to have earned to make sure that only 25% of the students scored higher than you?

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If the grades on a statistics test are normally distributed with a mean of 80 and a standard deviation of 5,
a.
What is the probability that a randomly selected student received a 70 or below?
Ans.
b. What grade would you have to have earned to make sure that only 25% of the students scored higher
than you?
Transcribed Image Text:If the grades on a statistics test are normally distributed with a mean of 80 and a standard deviation of 5, a. What is the probability that a randomly selected student received a 70 or below? Ans. b. What grade would you have to have earned to make sure that only 25% of the students scored higher than you?
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