1answer.
Ask question
Login Signup
Ask question
All categories
  • English
  • Mathematics
  • Social Studies
  • Business
  • History
  • Health
  • Geography
  • Biology
  • Physics
  • Chemistry
  • Computers and Technology
  • Arts
  • World Languages
  • Spanish
  • French
  • German
  • Advanced Placement (AP)
  • SAT
  • Medicine
  • Law
  • Engineering
bogdanovich [222]
3 years ago
9

An airplane has 100 seats for passengers. Assume that the probability that a person holding a ticket appears for the flight is 0

.90. If the airline sells 105 tickets, what is the probability that everyone who appears for the flight will get a seat
Mathematics
1 answer:
zmey [24]3 years ago
7 0

Answer:

96.33% probability that everyone who appears for the flight will get a seat

Step-by-step explanation:

I am going to use the binomial approximation to the normal to solve this question.

Binomial probability distribution

Probability of exactly x sucesses on n repeated trials, with p probability.

Can be approximated to a normal distribution, using the expected value and the standard deviation.

The expected value of the binomial distribution is:

E(X) = np

The standard deviation of the binomial distribution is:

\sqrt{V(X)} = \sqrt{np(1-p)}

Normal probability distribution

Problems of normally distributed samples can be solved using the z-score formula.

In a set with mean \mu and standard deviation \sigma, the zscore of a measure X is given by:

Z = \frac{X - \mu}{\sigma}

The Z-score measures how many standard deviations the measure is from the mean. After finding the Z-score, we look at the z-score table and find the p-value associated with this z-score. This p-value is the probability that the value of the measure is smaller than X, that is, the percentile of X. Subtracting 1 by the pvalue, we get the probability that the value of the measure is greater than X.

When we are approximating a binomial distribution to a normal one, we have that \mu = E(X), \sigma = \sqrt{V(X)}.

In this problem, we have that:

n = 105, p = 0.9

So

\mu = E(X) = np = 105*0.9 = 94.5

\sigma = \sqrt{V(X)} = \sqrt{np(1-p)} = \sqrt{105*0.9*0.1} = 3.07

What is the probability that everyone who appears for the flight will get a seat

100 or less people appearing to the flight, which is the pvalue of Z when X = 100. So

Z = \frac{X - \mu}{\sigma}

Z = \frac{100 - 94.5}{3.07}

Z = 1.79

Z = 1.79 has a pvalue of 0.9633

96.33% probability that everyone who appears for the flight will get a seat

You might be interested in
Find the area of a circle whose radius is<br> 52 km. Round to nearest tenth
goblinko [34]

Answer:

8494.87 is the actual answer but the rounded version is 8494.9

7 0
3 years ago
Read 2 more answers
Sarah’s mom took 3 hours to clean, but when Sarah helped, it took them 2 hours to clean. How many hours will it take Sarah to cl
Aleonysh [2.5K]

Answer:

<em>It takes them 1.875 hours.</em>

<em></em>

<em>Step-by-step explanation:</em>

<em></em>

<em>Here, the job is cleaning the house.</em>

<em></em>

<em>Mom does 1 job in 3 hours.</em>

<em></em>

<em>In 1 hour, mom does 1/3 of the job.</em>

<em></em>

<em>Dad does 1 job in 5 hours.</em>

<em></em>

<em>In 1 hour, dad does 1/5 of the job.</em>

<em></em>

<em>Mom and dad working together do the job in x hours.</em>

<em></em>

<em>In 1 hour, mom and dad together do 1/x of the job.</em>

<em></em>

<em>1/3 + 1/5 = 1/x</em>

<em></em>

<em>5/15 + 3/15 = 1/x</em>

<em></em>

<em>8/15 = 1/x</em>

<em></em>

<em>8x = 15</em>

<em></em>

<em>x = 15/8 = 1.875</em>

<em></em>

<em>Answer: It takes them 1.875 hours.</em>

your welcome

6 0
2 years ago
Read 2 more answers
Sydney took a taxi from her house to the airport. The taxi company charged a pick-up fee of $1.60 plus $1.75 per mile. The total
Firdavs [7]

The number of miles in the taxi ride is 6.22 miles.

It is required to find the number of miles in the taxi ride.

<h3>What is arithmetic?</h3>

The branch of mathematics dealing with the properties and manipulation of numbers. a science that deals with the addition, subtraction, multiplication, and division of numbers. Fractions, decimals, percentages, fractions, square root, exponents, and other arithmetic operations are used to achieve mathematical simplifications.

Given that:

The taxi company charged a pick-up fee of $1.60 for half distance.

The taxi company charged a pick-up fee of $1.75 for  another half distance.

The total fare was $20.85.

Let x be the number of miles in the taxi ride.

So, the equation will be,

$1.60x+$1.75x= $20.85.

3.35x=20.85

x=20.85/3.35

x=6.22 miles.

Hence, the number of miles in the taxi ride is 6.22 miles.

Learn more about arithmetic here:

brainly.com/question/11559160

#SPJ1

6 0
1 year ago
Complete each of the ratios on the table show calculations
arsen [322]

Answer:

From left to right:

2, 4, 32

Step-by-step explanation:

Using the one column which is completed, determine the ratio of yellow to blue by reducing to lowest terms.

yellow to blue = 8 to 16

8 and 16 are both divisible by 8. 8/8 = 1 and 16/8 = 2

8 to 16 = 1 to 2

This means there is half as much yellow paint as there is blue paint. If said backwards, there is double the amount of blue paint as there is yellow paint.

In the first two columns, yellow paint is blue paint divided by 2.

4/2 = 2

8/2 = 4

In the last column, blue paint is yellow paint times 2.

16 X 2= 32

All of the ratios yellow to blue are:

2 to 4

4 to 8

8 to 16

16 to 32

4 0
3 years ago
What is a 200yd football field in meters in Europe
timofeeve [1]

Answer:

180 meters

Step-by-step explanation:

100yd field is 90 meters so a 200yd field is 180 meters

8 0
3 years ago
Other questions:
  • Lilo wants to determine the average number of text middle school students in each day
    12·1 answer
  • Write the slope-intercept form of the equation for the line.
    11·1 answer
  • Can I get some help with this question
    7·1 answer
  • Despite popular belief, investigators have gotten a tip that the Loch Ness Monster is actually being kept as a pet in a Scottish
    14·1 answer
  • The volume of a sphere is 2145 cubic centimeters. What is the approximate diameter of this sphere?
    13·1 answer
  • What will turn 15 into 37.5 or 3.75
    15·1 answer
  • How to simplify -3(x+4)-(x-3)
    6·1 answer
  • A jacket that normally sells for $80 is on sale for 20% off. What is the sale price of the jacket?
    13·1 answer
  • Bill worked 24 hours last week and earns $8.25 per hour. what is the total amount of money he earned
    15·1 answer
  • What information is shown on the horizontal axis of a bar chart?
    14·1 answer
Add answer
Login
Not registered? Fast signup
Signup
Login Signup
Ask question!