The scores of students on an exam are normally distributed with a mean of 225 and a standard deviation of 38.
(a) What is the lower quartile score for this exam? (Recall that the first quartile is the value in a data set with 25% of the observations being lower.)
The scores of students on an exam are normally distributed with a mean of 225 and...
The scores on a psychology exam were normally distributed with a mean of 58 and a standard deviation of 6. A failing grade on the exam was anything 2 or more standard deviation below the mean. What was the cutoff for a failing score? Approximately what percentage of the students failed? The cutoff for a failing score was ____ Simplify answer) Approximately ___ percent of the students failed ( Round to one decimal place as needed)
a.) Test scores are normally distributed with a mean of 60 and a variance of 225. Joe scored at the 90th percentile which means that his score was? b.) Suppose X is normally distributed with mean 4 and standard deviation 4. Find the probability that 2X exceeds 7. c.) Test scores are normally distributed with a mean of 60 and a standard deviation of 15. Joe scored at the 95th percentile which means that his score was d.) a random...
The scores on a psychology exam were normally distributed with a mean of 57 and a standard deviation of 8. A failing grade on the exam was anything 2 or more standard deviations below the mean. What was the cutoff for a failing score? Approximately what percentage of the students failed? The cutoff for a failing score was______? (Simplify your answer)
The scores on a psychology exam were normally distributed with a mean of 62 and a standard deviation of 9. A failing grade on the exam was anything 2 or more standard deviations below the mean. What was the cutoff for a failing score? Approximately what percentage of the students failed? The cutoff for a failing score was 44. (Simplify your answer.) Approximately percent of the students failed. (Round to one decimal place as needed.)
Scores of 281 students on an exam were normally distributed with the mean 79 and the standard deviation of 6. Using the "68-95-99.7" rule, estimate how many students score above 91 O 15 O 14 Not enough information to answer the question None of the given numerical values is correct 10
Scores of 239 students on an exam were normally distributed with the mean 79 and the standard deviation of 6. Using the "68-95-99.7" rule, estimate how many students score above 91 9 Not enough information to answer the question 12 6 2 3 13 None of the given numerical values is correct
The scores on a psychology exam were normally distributed with mean of 55 and a standard deviation of 5. A failing grade on the exam was anything 2 or more standard deviations below the mean. What was the cutoff for a failing score? Approximately what percentage of the students failed? The cutoff for a failing score was 45. (Simplify your answer.) Approximately percent of the students failed. (Round to one decimal place as needed.)
The scores on a psychology exam were normally distributed with a mean of 55 and a standard deviation of 9. What is the standard score for an exam score of 41? The standard score is . (Round to the nearest hundredth as needed.)
1.) The scores for the final exam in Math 2250 is normally distributed with a mean of 60 and standard deviation of 15. Given that 120 students wrote the final exam, i.) State and test the hypothesis that the mean score is greater than 65 at a 10% level of significance. Include a p-value in your answer. 141 ii.) Construct and interpret 90% confidence level for the mean score. [3] Using the same level of significance, determine how many students...
Assume that adults have IQ scores that are normally distributed with a mean of 97.9 and a standard deviation 16.4 Find the first quartile Upper Q 1,which is the IQ score separating the bottom 25% from the top 75%. The first quartile is