HomeworkLib
Question

A final exam in MTH 160 has a mean of 73.0 with standard deviation 7.8.


A final exam in MTH 160 has a mean of 73.0 with standard deviation 7.8. If 45 students are randomly selected from MTH 160, find the probability that the mean of their test scores is less than 76. 

  • 0.9951 

  • 0.3503 

  • 0.6497 

  • 0.0049

math   Statistics-And-Probability   
0 0
Add a comment Improve this question Transcribed image text
Next > < Previous
Sort answers by oldest

Homework Answers

Answer #1

0 0
Add a comment
Know the answer?
Add Answer to:
A final exam in MTH 160 has a mean of 73.0 with standard deviation 7.8.
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. Our experts will answer your question WITHIN MINUTES for Free.
Similar Homework Help Questions

  • Question 3 20 pts For the HP-162 printer cartridge, the lifetime (in pages printed) are normally...

    Question 3 20 pts For the HP-162 printer cartridge, the lifetime (in pages printed) are normally distributed with a mean of 657.2 and a standard deviation of 38.4. If 17 cartridges are randomly selected, what is the probability that their mean lifetime is between 650 and 670 pages? 0.3044 O 0.2049 0.6956 0.7591 Question 4 20 pts A final exam in MTH 160 has a mean of 73.0 with standard deviation 7.8. If 45 students are randomly selected from MTH...

  • A final exam in Math 160 has a mean of 73 with standard deviation 7.73

    A final exam in Math 160 has a mean of 73 with standard deviation 7.73. Assume that a random sample of 24 students is selected and the test score of the sample is computed. Assuming the scores are normally distributed, what percentage of sample means are less than 69?

  • 8. Suppose the scores of students on an exam are normally distributed with mean u = 17.6 and standard deviation o = 4.9...

    8. Suppose the scores of students on an exam are normally distributed with mean u = 17.6 and standard deviation o = 4.9. (a) Determine the distribution of the sample mean score for a randomly selected sample of 36 students who took the exam. (b) Find the probability that the sample mean score will be less than 20 for a sample of 36 randomly selected students. (c) How large a sample size would be required to ensure that the probability...

  • 7) A retired statistics professor has recorded final exam results for decades. The mean final exam...

    7) A retired statistics professor has recorded final exam results for decades. The mean final exam score for the population of her students is 82.4 with a standard deviation of 6.5 . In the last year, her standard deviation seems to have changed. She bases this on a random sample of 25 students whose final exam scores had a mean of 80 with a standard deviation of 4.2 . Test the professor's claim that the current standard deviation is different...

  • The final exam scores in a business class were normally distributed with a mean of 80.5%...

    The final exam scores in a business class were normally distributed with a mean of 80.5% and a standard deviation of 4. Find the probability that a randomly selected student scored less than 73.9%.

  • Stats homework

    A final exam in Math 10 has a mean of 73 and a standard deviation of 7.8. If 24 students are randomly selected, find the probability that the mean of their testscores is less than 76.a. 0.7856 b. 0.5277 c. 0.8413 d. 0.9699

  • (4) The time required to complete a final exam in a particular college course is normally...

    (4) The time required to complete a final exam in a particular college course is normally distributed with a mean of 75 minutes and a standard deviation of 15 minutes. Answer the following questions: (a) (for a randomly selected student) What is the probability of completing the exam in 1 hour or less? (4) (b) What is the probability a randomly selected student will complete the exam in more than 60 minutes but less than 75 minutes? (4b) (c) Assume...

  • if statistics test scores were normally distributed with a mean of 81 and a standard deviation...

    if statistics test scores were normally distributed with a mean of 81 and a standard deviation of 4, a) what is the probability that a randomly selected student scored less than 70? b) what percentage of students had a B on the exam? c) the top 10% of the class had what grades?

  • QUESTION 20 The mean score on a standardized exam is 320 with a standard deviation of...

    QUESTION 20 The mean score on a standardized exam is 320 with a standard deviation of 40. Suppose 100 scores are randomly selected and you need to determine the probability that the sample mean is less than 310. Calculate the z-score necessary to do this 0.25 2.50 -2.50 -0.25

  • The final exam grade of a statistics class has a skewed distribution with mean of 76...

    The final exam grade of a statistics class has a skewed distribution with mean of 76 and standard deviation of 7.4. If a random sample of 36 students selected from this class, then what is the probability that the average final exam grade of this sample is between 75 and 80? Answer: (keep 4 decimal places)

ADVERTISEMENT
Free Homework Help App
Download From Google Play
Scan Your Homework
to Get Instant Free Answers
Need Online Homework Help?
Ask a Question
Get Answers For Free
Most questions answered within 3 hours.
ADVERTISEMENT
ADVERTISEMENT