At Fanshawe, students spend an average of 12.47 minutes per class texting.Suppose the minutes spent texting in class are normally distributed with a standarddeviation of 3.51 minutes. What is the probability that a randomly selectedFanshawe student spends more than 14 minutes texting in class?0.670.20050.79950.33

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Answered: At Fanshawe, students spend an average…

Advanced Engineering Mathematics

10th Edition

ISBN:9780470458365

Author:Erwin Kreyszig

Publisher:Erwin Kreyszig

Chapter2: Second-order Linear Odes

Section: Chapter Questions

Problem 1RQ

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Assume that adults have IQ scores that are normally distributed with a mean of 101.3 and a standard deviation of 20.2. Find the probability that a randomly selected adult has an IQ greater than 136.4
Assume that adults have IQ scores that are normally distributed with a mean of 96.9 and a standard deviation of 17.3. Find the probability that a randomly selected adult has an IQ greater than 116.5.
Assume that the average weight of an NFL player is 245.7 lbs with a standard deviation of 34.5 lbs. The distribution of NFL weights is not normal. Suppose you took a random sample of 32 players. What is the probability that the sample average will be less than 260 lbs?
It is flu season again. On average 549 UCI students get sick, with a standard deviation of 30 students. If there are 600 or more students who get sick, there is an epidemic. What is the probability there will be an epidemic?
Consider an exam with a mean of 76 and a standard deviation of 5 points. What is the probability that a randomly chosen student scored got a B or better on the exam (scored an 80 or better)? A. 0.3561 B. 0.7881 C. 0.4511 D. 0.2119
The time college students spend on the Internet follows a Normal distribution. At Johnson University, the mean time is 5 hours with a standard deviation of 1.2 hours. What is the probability that the average time 100 random students on campus will spend is between 1 hour and 5 hours on the Internet? 0.2 0.5
An electrical firm manufactures light bulbs that have a length of life that is normally distributed with mean equal to 787 hours and a standard deviation of 41 hours. Find the probability that a bulb burns between 769 and 806 hours. 0.3228 0.33 0.6772 0.3473
Assume that adults have IQ scores that are normally distributed with a mean of 103.9 and a standard deviation of 16.5. Find the probability that a randomly selected adult has an IQ greater than 132.4
Boston, Massachusetts, averages 211.7 sunny days per year. Assume that the number of sunny days follows a normal distribution with a standard deviation of 20 days. 20 What is the probability that Boston has less than 200 sunny days in a given year? a 0.2394 b 0.2520 c 0.2653 d 0.2793
At a large department store, the average number of years of service was 13.5 years with a standard deviation of 6.2 years. If an employee is picked at random, what is the probability that the employee has worked for the company over 23 years? 0.0318 0.0416 0.0416 0.0627
2.7 In China, four-year-olds average three hours a day unsupervised. Most of the unsupervised children live in rural areas, considered safe. Suppose that the standard deviation is 1.5 hours and the amount of time spent alone is normally distributed. We randomly select one Chinese four-year-old living in a rural area. We are interested in the amount of time the child spends alone per day. Find the probability that the child spends less than one hour per day unsupervised. (Leave answer in decimal form rounded to 2 decimal places)

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