A sample of final exam scores is normally distributed with a
mean equal to 20 and a variance equal to 16.
Part (a)
What percentage of scores are between 16 and 24? (Round your
answer to two decimal places.)
%
Part (b)
What raw score is the cutoff for the top 10% of scores? (Round
your answer to one decimal place.)
Part (c)
What is the proportion below 15? (Round your answer to four decimal places.)
Part (d)
What is the probability of a score less than 25? (Round your answer to four decimal places.)
A sample of final exam scores is normally distributed with a mean equal to 20 and...
A sample of final exam scores is normally distributed with a mean equal to 28 and a variance equal to 16. Part (a) What percentage of scores are between 24 and 32? (Round your answer to two decimal places.) Part (b) What raw score is the cutoff for the top 10% of scores? (Round your answer to one decimal place.) Part (c) What is the proportion below 23? (Round your answer to four decimal places.) Part (d) What is the...
A sample of final exam scores is normally distributed with a mean equal to 29 and a variance equal to 16. Part (a) What percentage of scores are between 25 and 33? (Round your answer to two decimal places.) Part (b) What raw score is the cutoff for the top 10% of scores? (Round your answer to one decimal place.) Part (c) What is the proportion below 23? (Round your answer to four decimal places.) Part (d) What is the...
A sample of final exam scores is normally distributed with a mean equal to 25 and a variance equal to 16. Part (a) What percentage of scores are between 21 and 29? (Round your answer to two decimal places.) Incorrect: Your answer is incorrect. % Part (b) What raw score is the cutoff for the top 10% of scores? (Round your answer to one decimal place.) Part (c) What is the proportion below 18? (Round your answer to four decimal...
A sample of final exam scores is normally distributed with a mean equal to 22 and a variance equal to 25. Part (a) What percentage of scores are between 17 and 27? (Round your answer to two decimal places.) % Part (b) What raw score is the cutoff for the top 10% of scores? (Round your answer to one decimal place.) Part (c) What is the proportion below 14? (Round your answer to four decimal places.) Part (d) What is...
A sample of final exam score is normally distributed with a mean equal to 20 and a variance equal to 25 (a) what percentage of scores is between 15 and 25 (b) what raw score is the cutoff for the top 10% of scores (c) what is the probability of a score less then 27 (d) what is proportion below 13
Exam grades: Scores on a statistics final in a large class were normally distributed with a mean of 79 and a standard deviation of 8. Use the TI-84 PLUS calculator to answer the following. Round the answers to at least four decimal places. (a) What proportion of the scores were above 932 (b) What proportion of the scores were below 66? (c) What is the probability that a randomly chosen score is between 70 and 90? Part: 0/3 Part 1...
Exam grades: Scores on a statistics final in a large class were normally distributed with a mean of 70 and a standard deviation of 11. Use the TI-84 PLUS calculator to answer the following. Round the answers to at least four decimal places. (a) What proportion of the scores were above 85? (b) What proportion of the scores were below 55? (c) What is the probability that a randomly chosen score is between 60 and 80? Part: 0/3 Part 1...
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.)
Exam grades: Scores on a statistics final in a large class were normally distributed with a mean of 79 and a standard deviation of 8. Use the TI-84 PLUS calculator to answer the following. Round the answers to at least four decimal places. (a) What proportion of the scores were above 93? (b) What proportion of the scores were below 66? (c) What is the probability that a randomly chosen score is between 70 and 90?
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.)