Question

The lifespan of my favorite candle follows a normal distribution with an average of 400 hours...

The lifespan of my favorite candle follows a normal distribution with an average of 400 hours and a standard deviation of 50. What is the probability that my candle lasts exactly 400 hours, no more no less? A 100% B 50% C 25% D 0%

Homework Answers

Answer #1

The correct option is D 0%. [ANSWER]

Explanation:

Let X denote the random variable representing the lifespan of the candle in hours.

Now, we are given that X follows a Normal distribution with mean 400 hours and standard deviation 50 hours.

Thus, X follows a continuous distribution.

Now, we know that for any continuous random variable the probability of getting any exact value is zero.

Thus, P(X=400) = 0 = 0% [ANSWER]

For any queries, feel free to comment and ask.

If the solution was helpful to you, don't forget to upvote it by clicking on the 'thumbs up' button.

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
Assume that the life of an engine follows a normal distribution with an average life of...
Assume that the life of an engine follows a normal distribution with an average life of 12 years and a standard deviation of 2 years. The manufacturer replaces without additional charge all the motors that fail during the warranty. a) What is the probability that an engine will fail after 14 years? b) What is the probability that the engine lasts between 4 to 13 years? c) A contractor buys 400 engines which is the probability that 70 or more...
The average life of a battery is 60 hours. Further, the life of the battery follows...
The average life of a battery is 60 hours. Further, the life of the battery follows a normal distribution with standard deviation of 5 hours. As a quality control manager, your goal is to limit the production of defective products. Your company considers a defective battery to be one that lasts less than 50 hours. Out of a batch of 100 batteries, what is the expected number of defective batteries?
the number of hours an American adult watches tv follows a normal distribution with an average...
the number of hours an American adult watches tv follows a normal distribution with an average of 6.9 hours a day with a standard deviation of .68 hours. If we take a random sample of 13 American adults what is the probability they have a sample mean less than 7.5 hours per day?
Battery life follows a normal continuous probability distribution with a population mean = 300 hours and...
Battery life follows a normal continuous probability distribution with a population mean = 300 hours and a population standard deviation of 30 hours. a. What is probability that a battery tested will last for less than 270 hours? b. What is probability that a battery tested will last between 270 and 330 hours?
The lifetime of a lightbulb follows a normal distribution with mean 1500 hours and standard deviation...
The lifetime of a lightbulb follows a normal distribution with mean 1500 hours and standard deviation of 100 hours. a. What is the probability that a lightbulb will last at least 1400 hours? b. What is the probability that a light bulb burns out in fewer than 1600 hours? c. What is the probability that a light bulb burns out in fewer than 1600 hours given that it has lasted 1400 hours? d. A technology breakthrough has occurred for which...
The length of time in hours that a certain part lasts follows a Weibull distribution with...
The length of time in hours that a certain part lasts follows a Weibull distribution with parameters α = 2 and β = 2. a. What are the mean and standard deviation of this distribution? b. What is the probability that the part lasts less than 1 hour? c. What is the equation for the failure rate of the part? d. If the distribution is actually Gamma instead of Weibull find the equation for the failure rate of the part...
battery life follows a normal continuous probability distribution with a population mean = 300 hours and...
battery life follows a normal continuous probability distribution with a population mean = 300 hours and a population standard deviation of 30 hours. What is probability that a battery tested will last for less than 270 hours? What is probability that a battery tested will last between 270 and 330 hours? The weakest 10% of the population will not exceed what battery life?
New heat lamps are reported to have the mean lifespan of 100 hours with a standard...
New heat lamps are reported to have the mean lifespan of 100 hours with a standard deviation of 15 hours. Before replacing their current lamp to the new heat lamps for the university, OSU decided to test whether the mean lifetime is equal to 100 or not by sampling 36 heat lamps. They turned them on and recorded the time, in hours, until each lamp failed. The sample provided a mean lifespan is 105.1 hours. a) According to the Central...
A company makes batteries with an average life span of 300 hours with a standard deviation...
A company makes batteries with an average life span of 300 hours with a standard deviation of 75 hours. Assuming the distribution is approximated by a normal curve fine the probability that the battery will last:(give 4 decimal places for each answer) a. Less than 250 hours b. Between 225 and 375 hours c. More than 400 hours
The lifetime of a certain battery follows a normal distribution with a mean 276 minutes and...
The lifetime of a certain battery follows a normal distribution with a mean 276 minutes and standard deviation 25 minutes. We took a random sample of 100 of these batteries. What is the probability that the sample mean of the lifetime will be less than 270 minutes?