Question

Professor Cory was disappointed with the scores on the most recent exam. Thirty students took the...

Professor Cory was disappointed with the scores on the most recent exam. Thirty students took the exam, and scores ranged from 35 to 89, with an average of 63.9 and a standard deviation of 9.2. To make the scores more appealing, Corey decided to “apply a curve” and add 15 points to all scores.

  1. What will be the sample mean of the curved scores?

  1. What will be the range of the curved scores?

  1. What will be the standard deviation of the curved scores?

  1. Upon double-checking the grading, Corey discovers a mistake in the grading of the exam which scored 35 and changes the score on that exam to 40. Although this is still the lowest score in the class, Corey is pleased to have caught and corrected the mistake. After this correction, what will be the sample mean of the scores before applying the curve?

  1. How will this correction change the standard deviation? (1) The standard deviation will go down, (2) the standard deviation will not change, (3) the standard deviation will increase, or (4) there is no way to tell.
Math   Statistics-And-Probability   
0 0
Add a commentTranscribed image text
Next >

Homework Answers

Answer #1

0 0
Know the answer?
Your Answer:

Post as a guest

Your Name:

What's your source?

Earn Coins

Coins can be redeemed for fabulous gifts.

Log In

Sign Up

Not the answer you're looking for?
Ask your own homework help question
Similar Questions
A math professor notices that scores from a recent exam are Normally distributed with a mean...
A math professor notices that scores from a recent exam are Normally distributed with a mean of 65 and a standard deviation of 9. (a) What score do 25% of the students exam scores fall below? (b) Suppose the professor decides to grade on a curve. If the professor wants 16% of the students to get an A, what is the minimum score for an A?
Suppose a professor gives an exam to a class of 40 students and the scores are...
Suppose a professor gives an exam to a class of 40 students and the scores are as follows. (Type the data set in StatCrunch.) 35 44 46 47 47 48 49 51 53 54 55 55 57 57 57 58 59 59 59 59 60 60 60 60 60 62 62 62 64 68 69 70 72 73 73 75 75 77 82 88     a.    Find each of the following: Mean: Median: Standard deviation: Z-score for a student who...
A math professor notices that scores from a recent exam are normally distributed with a mean...
A math professor notices that scores from a recent exam are normally distributed with a mean of 72 and a standard deviation of 5. (a) What score do 75% of the students exam scores fall below? Answer: (b) Suppose the professor decides to grade on a curve. If the professor wants 2.5% of the students to get an A, what is the minimum score for an A? Answer:
(1 pt) A math professor notices that scores from a recent exam are normally distributed with...
(1 pt) A math professor notices that scores from a recent exam are normally distributed with a mean of 65 and a standard deviation of 8. Answer the following questions using integer values. (a) What score do 25% of the students exam scores fall below? Answer: (b) Suppose the professor decides to grade on a curve. If the professor wants 2.5% of the students to get an A, what is the minimum score for an A? Answer:
A math professor notices that scores from a recent exam are Normally distributed with a mean...
A math professor notices that scores from a recent exam are Normally distributed with a mean of 72 and a standard deviation of 8. Suppose the professor decides to grade on a curve. If the professor wants 0.15% of the students to get an A, what is the minimum score for an A?
ADVERTISEMENT
Need Online Homework Help?

Get Answers For Free
Most questions answered within 1 hours.

Ask a Question
ADVERTISEMENT