Question

The length of time, L hours, that a phone will work before it needs charging is...

The length of time, L hours, that a phone will work before it needs charging is normally distributed with a mean of 90 hours and a standard deviation of 15 hours. Find the probability that

  1. The phone will work exactly 98 hours.                                                            

  1. The phone will work more than 127 hours                                                      

  1. The phone will work between 75 hours and 105 hours                                   

  1. The phone will work less than 75 hours or more than 120 hours.                   

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
For a certain type of computers, the length of time between charges of the battery is...
For a certain type of computers, the length of time between charges of the battery is normally distributed with a mean of 42 hours and a standard deviation of 18 hours. a. If 20 computers are randomly selected, what is the probability that the mean charging time of their batteries is more than 45 hours? b. If 38 computers are randomly selected, what is the probability that the mean charging time of their batteries is between 37 and 40 hours?...
11) The time needed to complete a final examination in a particular college course is normally...
11) The time needed to complete a final examination in a particular college course is normally distributed with a mean of 90 minutes and a standard deviation of 15 minutes. Answer the following questions. a. What is the probability of completing the exam in one hour or less? b. What is the probability that a student will complete the exam in more than 60 minutes but less than 105 minutes? c. Assume that the class has 60 students and that...
The length of time, in hours, it takes a group of people, 40 years and older,...
The length of time, in hours, it takes a group of people, 40 years and older, to play one soccer match is normally distributed with a mean of 2 hours and a standard deviation of0.5 hours. A sample of size 50 is drawn randomly from the population. Find the probability that the sample mean is less than 2.3 hours. A.Write the probability in terms of the statistic. B. Write the probability in terms of the z-score. C.Write the probability in...
For a certain type of computers, the length of time between charges of the battery is...
For a certain type of computers, the length of time between charges of the battery is normally distributed with a mean of 50 hours and a standard deviation of 15 hours. John owns one of these computers and want to know the probability that the length of time will be between 50 and 70 hours. Entry to a certain University is determined by a national test.  The scores on this test are normally distributed with a mean of 500 and...
The length of mobile phone calls for teenagers is known to be normally distributed, with a...
The length of mobile phone calls for teenagers is known to be normally distributed, with a mean calling time of 5 minutes and a standard deviation of 1.5 minutes. If a random sample of 36 phone calls is selected, what is the probability that the sample average time spent on calls is between 4.25 minutes and 5.75 minutes (four decimal places)?
The life of a fully-charged cell phone battery is normally distributed with a mean of 14...
The life of a fully-charged cell phone battery is normally distributed with a mean of 14 hours with a standard deviation of 3 hours. What is the probability that 25 batteries last less than 16 hours?
The time it takes for robots to defect is normally distributed with a mean time of...
The time it takes for robots to defect is normally distributed with a mean time of 1,500 hours and a standard deviation of 120 hours. a) What is the probability that a robot will ‘break down’ before 1680 hours? b) What is the probability that a robot breaks down between 1380 hours and 1590 hours?
Scores of adults aged 60 to 64 on a common IQ test are approximately Normally distributed...
Scores of adults aged 60 to 64 on a common IQ test are approximately Normally distributed with mean 90 and standard deviation 15 1. Since IQ scores of adults aged 60 to 64 are Normally distributed with mean 90 and sd 15, then about 40% of the scores are between a. 60 and 120 b. 45 and 135 c. 85 and 90 d. the 25th and 75th percentile e. the 30th and 70th percentile 2. What range of IQ scores...
The time needed to complete a final quiz in a particular college course is normally distributed...
The time needed to complete a final quiz in a particular college course is normally distributed with a mean of 77 minutes and a standard deviation of 12 minutes. Answer the following questions. a. What is the probability of completing the quiz in one hour or less (to 4 decimals)? b. What is the probability that a student will complete the quiz in more than 60 minutes but less than 75 minutes (to 4 decimals)? c. Assume that the class...
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 77 minutes and a standard deviation of 12 minutes. Answer the following questions. a. what is the probability of completing the exam in one hour or less (to 4 decimals) b. what is the probability that a student will complete the exam in more than 60 minutes but less than 75 minutes (to 4 decimals) c. assume that the class...
ADVERTISEMENT
Need Online Homework Help?

Get Answers For Free
Most questions answered within 1 hours.

Ask a Question
ADVERTISEMENT