I MISSED THIS PART OF THE LECTURE! I had to go to the hospital, my lack of knowledge in this subject is not due to laziness. I have everything else down but normal distribution and plan on going to the success center at my college as soon at it opens at 3 for math. Until then if I could get a little insight I would REALLY appreciate it! Thank you!!!
One method of "grading on a curve" uses the normal distribution curve with the scheme shown in the table below, where z is the number of standard deviations a score is from the mean.
The mean on an exam in a large section class of 120 students was 73.9 with a standard deviation of 12.8. Approximately how many students will get a grade of B or higher? [If a decimal occurs, round your answer up to the next whole person.]
approximate number of students:
| 4. The mean score on a standardized aptitude test was 100 with a standard deviation of 10. Assume the scores are normally distributed. The percentage of the people who took this test and had a score between 102 and 112 is ________%. You only need to submit a numerical value - do not include the % sign with your answer. Round your answer to 1 decimal place.
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One method of "grading on a curve" uses the normal distribution curve with the scheme shown in the table below, where z is the number of standard deviations a score is from the mean.
The mean on an exam in a large section class of 120 students was 73.9 with a standard deviation of 12.8. Approximately how many students will get a grade of B or higher? [If a decimal occurs, round your answer up to the next whole person.]
Score | Grade |
z > 1.5 | A |
0.5 < z < 1.5 | B |
−0.5 < z < 0.5 | C |
−1.5 < z < −0.5 | D |
z < −1.5 | F |
approximate number of students:
| 7. Assume that adults have IQ scores that are normally distributed with a mean of 100 and a standard deviation of 15. Answer the following based on this information rounding your answer to 3 decimal places. Find the probability a randomly selected adult has an IQ scores that is greater than 140. |