Stats -problems on normal distribution

 

Don't use plagiarized sources. Get Your Custom Essay on
Stats -problems on normal distribution
Just from $13/Page
Order Essay

Directions: Draw a clearly labeled diagram and then solve each problem.

 

1. The gestation period (length of pregnancy) for male babies born in New York is normally distributed with a mean of 39.4 weeks and a standard deviation of 2.43 weeks.

(a) What percent of mothers of male babies are pregnant for less than 35 weeks?

(b) What percent of mothers of male babies are pregnant for between 35 and 40 weeks?

(c) What percent of mothers of male babies are pregnant for more than 40 weeks?

(d) Suppose a sailor had shore leave 46 weeks ago and his wife is delivering a baby today. What should the sailor say to his wife when he gets home?

2. Suppose that a school district wants to start a program for gifted students. The participants in the program are to be chosen on the basis of IQ scores (normal withm = 100,s = 15). If the school district wants only the top 2% of students to participate in the program, what should be the IQ score that students must exceed to be accepted?

 

3. The daily demand for gas at Good’s Gas station is normally distributed with a mean of 1812 gallons and a standard deviation of 254 gallons.

(a) What is the probability that the demand for gas will exceed 2000 gallons on any day?

(b) What is the probability that the demand for gas in a day will be between 1500 and 2000 gallons?

(c) What is the probability that the demand for gas will exceed 1500 gallons on any day?

d) how much gasoline should the station have on hand at the beginning of the day so that the probability of running out of gas that day is only 1%?

 

4. 10% of Americans are left handed.

(a) If 6 people are selected at random, what is the probability that more than 3 of them are left-handed?

(b) Suppose a group of 600 mathematicians get together for a conference. What is the probability that more than 80 of them are left-handed? (Use the normal approximation to the binomial)

 

5. Airlines sell more tickets for a flight than the number of available seats (overbooking). They do this because they know from past experience that only 90% of ticketed passengers actually show up for the flight. A plane has 325 seats. If the airline sells 350 tickets for a flight, what is the probability that the flight will be overbooked (the number of passengers who show up is greater than the number of available seats)?

 

6. The mean pulse rate for adults is 72 beats per minute (www.healthepic.com) and let’s suppose that the standard deviation is 10. Find:

a. The probability that a randomly chosen adult has a pulse rate over 80 assuming that the rates are normally distributed.

b. The probability that a random sample of 19 adults will have a mean pulse rate over 80.

Place your order
(550 words)

Approximate price: $22

Calculate the price of your order

550 words
We'll send you the first draft for approval by September 11, 2018 at 10:52 AM
Total price:
$26
The price is based on these factors:
Academic level
Number of pages
Urgency
Basic features
  • Free title page and bibliography
  • Unlimited revisions
  • Plagiarism-free guarantee
  • Money-back guarantee
  • 24/7 support
On-demand options
  • Writer’s samples
  • Part-by-part delivery
  • Overnight delivery
  • Copies of used sources
  • Expert Proofreading
Paper format
  • 275 words per page
  • 12 pt Arial/Times New Roman
  • Double line spacing
  • Any citation style (APA, MLA, Chicago/Turabian, Harvard)

Our guarantees

Delivering a high-quality product at a reasonable price is not enough anymore.
That’s why we have developed 5 beneficial guarantees that will make your experience with our service enjoyable, easy, and safe.

Money-back guarantee

You have to be 100% sure of the quality of your product to give a money-back guarantee. This describes us perfectly. Make sure that this guarantee is totally transparent.

Read more

Zero-plagiarism guarantee

Each paper is composed from scratch, according to your instructions. It is then checked by our plagiarism-detection software. There is no gap where plagiarism could squeeze in.

Read more

Free-revision policy

Thanks to our free revisions, there is no way for you to be unsatisfied. We will work on your paper until you are completely happy with the result.

Read more

Privacy policy

Your email is safe, as we store it according to international data protection rules. Your bank details are secure, as we use only reliable payment systems.

Read more

Fair-cooperation guarantee

By sending us your money, you buy the service we provide. Check out our terms and conditions if you prefer business talks to be laid out in official language.

Read more

Order your essay today and save 15% with the discount code LOCKDOWN