Question

The time spent on an exam by a class of 100 students is normally distributed with...

The time spent on an exam by a class of 100 students is normally distributed with a mean of 50 minutes and a standard deviation of 8 minutes. Using the percentage approximations for the normal curve, what is the percentage of the population of all exam takers that would spend between 50 to 62 minutes on the exam? (Use of Z table is necessary)

A. 41.92%

B. 43.32%

C. 8.08%

D. 6.68%

Math   Statistics-And-Probability   
0 0
Add a commentTranscribed image text
Next >

Homework Answers

Answer #1

B IS CORRECT OPTION.

If there is any understanding problem regarding this please feel free to ask any doubt in comment box. Thank you.

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
The time needed to complete a final examination in a particular college course is normally distributed...
The time needed to complete a final examination in a particular college course is normally distributed with a mean of 80 minutes and a standard deviation of 10 minutes. If students have only 100 minutes to complete the exam, what percentage of the class will not finish the exam in time?
The time spent by students working on this exam can be approximated by a normal random...
The time spent by students working on this exam can be approximated by a normal random variable with mean value μ = 60 minutes and standard deviation σ = 5 minutes. (a) What is the probability that a student finishes this exam in less than 50 minutes? (b) What is the probability that a student spends between 60 minutes and 70 minutes taking this exam?
The time spent by students working on this exam can be approximated by a normal random...
The time spent by students working on this exam can be approximated by a normal random variable with mean value μ = 60 minutes and standard deviation σ = 5 minutes. (a) What is the probability that a student finishes this exam in less than 50 minutes? (b) What is the probability that a student spends between 60 minutes and 70 minutes taking this exam?
Class scores are normally distributed with a μ= 100 and σ = 16 a) If a...
Class scores are normally distributed with a μ= 100 and σ = 16 a) If a student has a score of 125, what percentage of students have higher scores? Draw the curve and decide where the Z score falls on it. b) If a student has a score of 90, what percentage of students have higher scores? Draw the curve and decide where the Z score falls on it.
4. Exam scores in Professor Curm’s Calculus class are approximately normally distributed with a mean of...
4. Exam scores in Professor Curm’s Calculus class are approximately normally distributed with a mean of 71 and a standard deviation of 13. Exam scores in Professor Polly’s Calculus class are approximately normally distributed with a mean of 83 and a standard deviation of 7. Assume each class is made up of random draws from the same underlying student population, and so comparable in principle .a) Compare a student who got a 68 in Curm’s class to one that got...
The time, in minutes spent texting in class, is approximately normally distributed with a mean of...
The time, in minutes spent texting in class, is approximately normally distributed with a mean of 6.2 minutes and a standard of 1.6 minutes. The distance, in city blocks, that a student must travel to get from one class to the next has a Chi-squared distribution with 4 degrees of freedom. (The standard city block is approximately 400 feet long) 1) What is the probability that the average time spent texting in a class of 12 random students is between...
At school, students spend an average of 13.38 minutes per class texting. Suppose the minutes spent...
At school, students spend an average of 13.38 minutes per class texting. Suppose the minutes spent texting in class are normally distributed with a standard deviation of 3.27 minutes. What is the probability that a randomly selected student spends more than 17 minutes texting in class? a) 0.8665 b) 0.1335 c) 0.1515 d) 0.8485
Grading on the Curve: A final exam for a large class of students is constructed so...
Grading on the Curve: A final exam for a large class of students is constructed so that final exam grades follow a normal distribution with mean µ and standard deviation σ. The class is graded on the curve, which means that a final exam score of x translates into a final exam letter grade according to the following table: Grade Range A µ + σ < x B µ < x < µ + σ C µ − σ <...
25 randomly selected students took a survey on how long they spent on social media. The...
25 randomly selected students took a survey on how long they spent on social media. The mean number of minutes these students spent on social media was 205.1 minutes with a standard deviation of 150 minutes.The population of the time spent on social media is normally distributed. Construct a 98%confidence interval for the population standard deviation of the time students spend on social media.
IQ scores are known to be normally distributed with a mean of 100 and a standard...
IQ scores are known to be normally distributed with a mean of 100 and a standard deviation of 16. a. Determine the percentage of students who score between 85 and 120. b. Determine the percentage of students who score 80 or greater. c. Obtain the quartiles, Q1, Q2, and Q3 for the IQ scores, and show this on a sketch of a normal curve. Include both a z-axis and an x-axis below the curve. d. If Mensa only accepts the...
ADVERTISEMENT
Need Online Homework Help?

Get Answers For Free
Most questions answered within 1 hours.

Ask a Question
ADVERTISEMENT