Question

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?

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
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 to complete a standardized exam is approximately Normal with a mean of 70 minutes...
The time to complete a standardized exam is approximately Normal with a mean of 70 minutes and a standard deviation of 10 minutes. (z (X-μ)/σ) μ= σ= A) If students are given 85 minutes to complete the exam, what probability that students will not finish? B) What percent of students will complete the exam between 63 minutes and 80 minutes?
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%
(a) The time spent (in minutes) per day on reading newspaper by an adult can be...
(a) The time spent (in minutes) per day on reading newspaper by an adult can be approximated by a normal distribution with mean 15 minutes and standard deviation 3 minutes. i. Find the probability that the reading time per day for a randomly selected adult is more than 18 minutes. ii. What is the shortest time spent in reading newspaper for an adult per day that would still place him in the top 9%? iii. How many adults spent less...
In an examination the probability distribution of scores (X) can be approximated by normal distribution with...
In an examination the probability distribution of scores (X) can be approximated by normal distribution with mean 61 and standard deviation 9.4. 1. Suppose one has to obtain at least 55 to pass the exam. What is the probability that a randomly selected student passed the exam? [Answer to 3 decimal places] 2. If two students are selected randomly what is the chance that both the students failed? [Answer to 3 decimal places] 3. If only top 8% students are...
The amount of time spent by a statistical consultant with a client at their first meeting...
The amount of time spent by a statistical consultant with a client at their first meeting is a random variable having a normal distribution with a mean value of 60 minutes and a standard deviation of 10 minutes. What is the probability that more than 45 minutes is spent at the first meeting? Round your answer to three decimal places.
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...
In an examination the probability distribution of scores (X) can be approximated by normal distribution with...
In an examination the probability distribution of scores (X) can be approximated by normal distribution with mean 63.2 and standard deviation 7.6. *Please explain how you got your answers. 1) Suppose one has to obtain at least 55 to pass the exam. What is the probability that a randomly selected student passed the exam? [Answer to 3 decimal places] Tries 0/5 2) If two students are selected randomly what is the chance that both the students failed? [Answer to 3...
Ninety minutes are allowed for students to complete the multiple-choice section of a national exam.  A random...
Ninety minutes are allowed for students to complete the multiple-choice section of a national exam.  A random sample of 28 students selected from the students at a large high school took a practice exam, and the time (in minutes) that it took each student to complete the multiple-choice section was recorded.  The times are given below. Time to Complete the Multiple Choice Section 58 76 74 80 88 74 65 97 66 95 77 63 83 73 64 71 60 68 70...
The heights of European 13-year-old boys can be approximated by a normal model with mean μ...
The heights of European 13-year-old boys can be approximated by a normal model with mean μ of 63.1 inches and standard deviation σ of 2.32 inches. A random sample of 9 European 13-year-old boys is selected. What is the probability that the sample mean height x is greater than 65.7 inches? (use 4 decimal places in your answer)
ADVERTISEMENT
Need Online Homework Help?

Get Answers For Free
Most questions answered within 1 hours.

Ask a Question
ADVERTISEMENT