Question

In the recent history of an introductory econometrics course, the final grades of students have a...

In the recent history of an introductory econometrics course, the final grades of students have a mean of 75, a standard deviation of 6 and are approximately normally distributed. In which of the following intervals do you expect 95% of final grades to lie in?

None of the other answers is correct.

In the interval (60,90).

In the interval (69,81).

In the interval (63,87).

Homework Answers

Answer #1

Answer:

In the interval (63,87).

Explanation:

Mean () = 75

Standard deviation() = 6

For normal distribution approximately about 95% of the values fall within two standard deviations from the mean.

In this case, 2* = 2*6 = 12.

Therefore, the range within which 95% values lie = ( - 2, +2) = (75-12, 75+12) = (63, 87)

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
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 73 and a standard deviation of 8.2. (i) What is the probability that a student scored below 91 on this exam? (ii) What is the probability that a student scored between 65 and 89? (iii) Given that 15% of the students scored grade B. What is the cut-off mark for grade B?
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 8.the probability is 15% that a student taking the test scores higher than what grade. the probability is 15% 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 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...
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...
Question 1 1. A set of final examination grades in an introductory statistics course is normally...
Question 1 1. A set of final examination grades in an introductory statistics course is normally distributed with a mean of 85 and a standard deviation of 12. a) What is the probability of getting a grade of 95 on this exam? b) What is the probability that a student scored less than 55 and more than79? c) The probability is 8% that a student taking the test scores higher than than what grade? d) If the professor grades on...
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...
PROBLEM: A set of final examination grades in an introductory statistics course was found to be...
PROBLEM: A set of final examination grades in an introductory statistics course was found to be normally distributed with a mean of 73 and a standard deviation of 8. Use Excel to determine the following values to 6 (round up) decimal place accuracy. Fill in the following values. 1. Determine the probability of getting a grade that is less than 85.Answer____________________________________ 2. Determine the probability of getting a grade that is greater than 90.Answer__________________________________ 3. Determine the probability of getting...
uestion 1 1. A set of final examination grades in an introductory statistics course is normally...
uestion 1 1. A set of final examination grades in an introductory statistics course is normally distributed with a mean of 73 and a standard deviation of 8. a) What is the probability of getting a grade of 91or less on this exam? b) what is the probability that a student scored between 65 and 89? c) The probability is 5% that a student taking the test scores higher than than what grade? d) If the professor grades on a...
The distribution of grades in an introductory finance class is normally distributed, with an expected grade...
The distribution of grades in an introductory finance class is normally distributed, with an expected grade of 71. If the standard deviation of grades is 14, in what range would you expect 68.26 percent of the grades to fall? (Round answers to 2 decimal places, e.g. 15.25. Hint: Think in terms of what the expected highest and lowest scores would be for 68.26% of the students taking the exam.)
A set of final examination grades in a calculus course was found to be normally distributed...
A set of final examination grades in a calculus course was found to be normally distributed with a mean of 69 and a standard deviation of 9. What is the probability of getting a grade of 91 or less on this exam? 0.50 .9927 0.0073 1.00