According to a certain website, the average daily time spenton social networking by internet users worldwide is 145minutes. Assume the standard deviation is 45 minutes andthat the probability distribution is normal. What is theprobability that a randomly selected person spends daily atleast 3 hours on social networking?Select one:a. 0.7794O b. 0.2206c. 0.7823O d. 0.2177

The random variable daily time spent on social networking follows normal distribution. The…

Answered: According to a certain website, the…

MATLAB: An Introduction with Applications

6th Edition

ISBN:9781119256830

Author:Amos Gilat

Publisher:Amos Gilat

Chapter1: Starting With Matlab

Section: Chapter Questions

Problem 1P

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An electrical firm manufactures light bulbs that have a length of life that is normallydistributed with mean equal to 800 hours and a standard deviation of 40 hours. Findthe probability that a bulb burns between 778 and 834 hours.
A professor knows that her statistics students' final exam scores have a mean of 79 and a standard deviation of 12.4. In his class, an "A" is any exam score of 90 or higher. This quarter she has 25 students in her class. What is the probability that 7 students or more will score an "A" on the final exam?
One brand of baby bathtub comes with a dial to set the water temperature. When the “babysafe” setting is selected and the tub is filled, the temperature X of the water follows a Normal distribution with a mean of 93.2°F and a standard deviation of 3.6°F. According to pediatricians, the temperature of a baby’s bathwater should be between 90°F and 100°F. Find the probability that the water temperature on a randomly selected day when the “babysafe” setting is used meets pediatricians’ recommendations. One brand of baby bathtub comes with a dial to set the water temperature. When the “babysafe” setting is selected and the tub is filled, the temperature X of the water follows a Normal distribution with a mean of 93.2°F and a standard deviation of 3.6°F. According to pediatricians, the temperature of a baby’s bathwater should be between 90°F and 100°F. Find the probability that the water temperature on a randomly selected day when the “babysafe” setting is used meets pediatricians’…
The life of a vacuum cleaner is normally disyributed with mean 5 years and standard deviation 2 year. find the probability that it lasts less than 4 years.
An electrical firm manufactures light bulbs that have a length of life that is normally distributed with mean equal to 818 hours and a standard deviation of 43 hours. Find the probability that a bulb burns between 782 and 871 hours. (Write your final answer in decimal form, and round off to 4 decimal places.)
According to a survey, the average weight of NFL players is 254 lbs. with a standard deviation of 44 lbs., find the probability that a group of 49 randomly selected NFL players will have an average weight less than 265 lbs
Assume that people playing World of Warcraft in a week has a normal distribution with a mean of 54 hours and a standard deviation of 11 hours. Find the probability that a randomly selected person played more than 89 hours. Round to four decimals places.
In a dorm, the weights of the students are normally distributed with mean 175 lbs and standard deviation 16 pounds. What is the probability that a person weighs at least 200 lbs? (round to the nearest thousandth)
The height of Christmas trees are normally distributed. The standard deviation of Christmas trees is 200 inches and the mean height is 1400 inches. What is the probability that a randomly selected Christmas tree is between 1100 and 1438 inches?
A particular fruit's weights are normally distributed, with a mean of 360 grams and a standard deviation of 28 grams.If you pick 7 fruit at random, what is the probability that their mean weight will be between 342 grams and 360 grams
The average age of the JYP employees is known to be 32 years and the standard deviation is 5 years. Find the probability that a random sample of 36 employees will have an average age of less than 30 years. What is the probability of 36 employees who have an average age of less than 30 years?
In a recent year, grade 7 Maryland State public school students taking a mathematics assessment test had a mean score of 230 with a standard deviation of 23. Assume the scores are normally distributed. Find the probability that a student had a score higher than 285.

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