Question

Scores on Professor Combs' Statistics Final Exams have a long term history of being normally distributed,...

Scores on Professor Combs' Statistics Final Exams have a long term history of being normally distributed, with a mean of μμ = 72 and a standard deviation of σσ = 9

a.) Find the probability that a single student will score above a 77 on the Final exam.

b.) Find the probability that a single student will score between a 67 and 77 on the Final exam.

c.) Find the probability that an entire class of 20 students will have a class average above a 77 on the exam.

d) Find the probability that an entire class of 20 students will have a class average between 67 and 77 on the Final exam.

Homework Answers

Know the answer?
Your Answer:

Post as a guest

Your Name:

What's your source?

Earn Coins

Coins can be redeemed for fabulous gifts.

Not the answer you're looking for?
Ask your own homework help question
Similar Questions
Student scores on Professor Combs' Stats final exam are normally distributed with a mean of 73...
Student scores on Professor Combs' Stats final exam are normally distributed with a mean of 73 and a standard deviation of 6.5 Find the probability of the following: **(use 4 decimal places)** a.) The probability that one student chosen at random scores above an 78. b.) The probability that 20 students chosen at random have a mean score above an 78. c.) The probability that one student chosen at random scores between a 68 and an 78. d.) The probability...
Student scores on Professor Combs' Stats final exam are normally distributed with a mean of 73...
Student scores on Professor Combs' Stats final exam are normally distributed with a mean of 73 and a standard deviation of 6.5 Find the probability of the following: **(use 4 decimal places)** a.) The probability that one student chosen at random scores above an 78. b.) The probability that 20 students chosen at random have a mean score above an 78. c.) The probability that one student chosen at random scores between a 68 and an 78. d.) The probability...
Student scores on Professors' Stats final exam are normally distributed with a mean of 72 and...
Student scores on Professors' Stats final exam are normally distributed with a mean of 72 and a standard deviation of 6.9 Find the probability of the following: **(use 4 decimal places)** a.) The probability that one student chosen at random scores above an 77. b.) The probability that 20 students chosen at random have a mean score above an 77. c.) The probability that one student chosen at random scores between a 67 and an 77. d.) The probability that...
A professor knows that her statistics students' final exam scores have a mean of 78 and...
A professor knows that her statistics students' final exam scores have a mean of 78 and a standard deviation of 9.3. In his class, an "A" is any exam score of 90 or higher. This quarter she has 25 students in her class. What is the probability that 4 students or more will score an "A" on the final exam?
A large statistics class consists of 250 students. On the final exam, the professor worries that...
A large statistics class consists of 250 students. On the final exam, the professor worries that question 13 might be unfair. He resolves to drop question 13 if less than 40% of the class correctly answers the question. After grading 125 randomly selected final exams (out of 250 taken), a student calls the professor and asks if question 13 will be dropped. The professor looks at the graded exams and notes that 46 of the 125 graded exams got question...
A set of final examination grades in an introductory statistics course is normally distributed, with a...
A set of final examination grades in an introductory statistics course is normally distributed, with a mean of 72 and a standard deviation of 9. a) What is the probability that a student scored below 89 on this exam? (Round to 4 decimal places as needed.) b) What is the probability that a student scored between 63 and 95? (Round to 4 decimal places ad needed.) c) The probability is 5% that a student taking the test scores higher than...
A set of final examination grades in an introductory statistics course is normally distributed, with a...
A set of final examination grades in an introductory statistics course is normally distributed, with a mean of 70 and a standard deviation of 9. What is the probability that the student scored below 88 on this exam What is the probability that a student scored between 61 and 92.5 The probability is 5% that a student taking the test scores higher than what grade If the professor grades on a curve --gives A’s to the top 10% of the...
Student scores on the Stats final exam are normally distributed with a mean of 75 and...
Student scores on the Stats final exam are normally distributed with a mean of 75 and a standard deviation of 6.5 Find the probability of the following: (use 4 decimal places) a.) The probability that one student chosen at random scores above an 80. b.) The probability that 10 students chosen at random have a mean score above an 80. c.) The probability that one student chosen at random scores between a 70 and an 80. d.) The probability that...
The professor of a Statistics class has stated that, historically, the distribution of final exam grades...
The professor of a Statistics class has stated that, historically, the distribution of final exam grades in the course resemble a Normal distribution with a mean final exam mark of μ=60μ=60% and a standard deviation of σ=9σ=9%. (a) What is the probability that a random chosen final exam mark in this course will be at least 73%? Answer to four decimals. equation editor (b) In order to pass this course, a student must have a final exam mark of at...
a set of final examination grades in an introductory statistics course is normally distributed with a...
a set of final examination grades in an introductory statistics course is normally distributed with a mean of 77 and a standard deviation of 7 complete parts a through d. a. what is the probability that a student scored below 89 on this exam b. what is the probability that a student scored between 70 and 93 c. the probability is 15% that a student taking the test scores higher than what grade d. if the professor grades on a...