Question
In: Statistics and Probability
Suppose that scores on a test are normally distributed with a mean of 80 and a...
Suppose that scores on a test are normally distributed with a mean of 80 and a standard deviation of 8. Determine the score that would be considered the first/lower quartile (??)
Solutions
Expert Solution
Here we need to find x such that 
Using standard normal table we get 
So 
Hence 
orchestra answered 1 year agoRelated Solutions
Suppose that scores on a test are normally distributed with a mean of 80 and a...
Suppose that scores on a test are normally distributed with a
mean of 80 and a standard deviation
of 8. Which of the following questions below are of type B?
a. Find the 80th percentile.
b. Find the cutoff for the A grade if the top 10% get an A.
c. Find the percentage scoring more than 90.
d. Find the score that separates the bottom 30% from the top
70%.
e. Find the probability that a randomly selected student...
Assume that a set of test scores is normally distributed with a mean of 80 and...
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A set of test scores is normally distributed. If 80% of the scores are above 90...
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Suppose the scores earned on a statistics test are normally distributed with a mean of 65...
Suppose the scores earned on a statistics test are normally
distributed with a mean of 65 and a standard deviation 8. The
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