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The average time needed to complete an aptitude test is 90 minutes with a standard deviation of 10 minutes. The exam starts at 10 am. The test giver wants to give enough time so that 84% of the students are able to complete the exam. What time should the exam stop?

The average time needed to complete an aptitude test is 90 minutes with a standard deviation of 10 minutes. The exam starts at 10 am. The test giver wants to give enough time so that 84% of the students are able to complete the exam. What time should the exam stop?

Advanced Engineering Mathematics
Advanced Engineering Mathematics
10th Edition
ISBN:9780470458365
Author:Erwin Kreyszig
Publisher:Erwin Kreyszig
Chapter2: Second-order Linear Odes
Section: Chapter Questions
Problem 1RQ
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Answer question 6 please
grade? of 60 on 3 exams. After her 4th exam her average is an 65. What was her 4th exam 3. A student's gpa at the beginning of a semester is 2.1 after 97 credits. Her current semester grades were a 3.1 after 12 credits. Estimate her new overall gpa? 2.1=97 crearts 311=12 Credits 4. A student received a 73 and a 79 on her first two exams. To have an average of 80, what should her grade be on her third exam? 5. Sarah has taken three exams. Her median grade is a 25, her mean is a 26 and the range of the three exam grades is 11. What are the three exam grades? 6. The average time needed to complete an aptitude test is 90 minutes with a standard deviation of 10 minutes. The exam starts at 10 am. The test giver wants to give enough time so that 84% of the students are able to complete the exam. What time should the exam stop? 7. Find the area or percent under the standard normal curve that lies between z = 0 and z= 1.0. Sketch the curve and shade in the region described.
Transcribed Image Text:grade? of 60 on 3 exams. After her 4th exam her average is an 65. What was her 4th exam 3. A student's gpa at the beginning of a semester is 2.1 after 97 credits. Her current semester grades were a 3.1 after 12 credits. Estimate her new overall gpa? 2.1=97 crearts 311=12 Credits 4. A student received a 73 and a 79 on her first two exams. To have an average of 80, what should her grade be on her third exam? 5. Sarah has taken three exams. Her median grade is a 25, her mean is a 26 and the range of the three exam grades is 11. What are the three exam grades? 6. The average time needed to complete an aptitude test is 90 minutes with a standard deviation of 10 minutes. The exam starts at 10 am. The test giver wants to give enough time so that 84% of the students are able to complete the exam. What time should the exam stop? 7. Find the area or percent under the standard normal curve that lies between z = 0 and z= 1.0. Sketch the curve and shade in the region described.
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