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
joja [24]
2 years ago
7

Find the upper 20%of the weight?

Mathematics
1 answer:
meriva2 years ago
6 0

Answer:

The upper 20% of the weighs are weights of at least X, which is X = 0.84\sigma + \mu, in which \sigma is the standard deviation of all weights and \mu is the mean.

Step-by-step explanation:

Normal Probability Distribution:

Problems of normal distributions can be solved using the z-score formula.

In a set with mean \mu and standard deviation \sigma, the z-score 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 p-value, we get the probability that the value of the measure is greater than X.

Upper 20% of weights:

The upper 20% of the weighs are weighs of at least X, which is found when Z has a p-value of 0.8. So X when Z = 0.84. Then

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

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

X = 0.84\sigma + \mu

The upper 20% of the weighs are weights of at least X, which is X = 0.84\sigma + \mu, in which \sigma is the standard deviation of all weights and \mu is the mean.

You might be interested in
Pls help me! I'm confused
seraphim [82]
Just put them in order from least to greatest and find out in between which number to put them . For example put 24 between 20 and 25.

Hope that helps .
6 0
3 years ago
Read 2 more answers
Drilon got 63 out of 72 correct in his test. What fraction of the marks did he get correct?
tatyana61 [14]

Answer:

87.5%

Step-by-step explanation:

6 0
3 years ago
Read 2 more answers
A towns population went from 25800 to 42600 in 15 years. What was the percent of change
Novay_Z [31]
42600-25800=16800
16800/15=1120 
42600*x=100*1120
x=112000/42600=2.62%
4 0
3 years ago
Find the slope and the y-intercept of the line<br> slope intercept is:<br> y=-5/2x+5
PtichkaEL [24]

Answer:

the slope is : -5/2

y-intercept is: 5

Step-by-step explanation:

8 0
2 years ago
Read 2 more answers
Suppose that y varies directly as the square of x, and that y=567 when x=9. What is y when x=4
Gwar [14]

Answer:

y  = 112

Step-by-step explanation:

If  y varies directly as the square of x

mathematically;

y ∝ x²

y = kx² where 'k' is the constant of proportionality

let u know the value of k for this equation by making k the subject of the formular from y = kx²

divide both sides by x²

k = y / x²

given that  y = 567 x = 9

k = 567/(9)²

k = 567/81

k = 7

now to get the value of  y when x = 4

from the equation conneting x, y,

y = kx²

y = 7 × (4)²

y = 7 × 16

y  = 112

6 0
2 years ago
Other questions:
  • The sum of three consecutive is 267. What is the largest integer
    5·1 answer
  • The table shows the height of different plants in inches.
    14·1 answer
  • How many meters did he travel during practice
    15·2 answers
  • An airplane flies at an altitude of 14,690 ft while a submarine is submerged at a depth of 521 feet below the surface of the oce
    8·1 answer
  • How do i factor x^3 +64​
    12·1 answer
  • Sixty percent of the customers who go to Sears Auto Center for tires buy four tires and 22% buy two tires. Moreover, 12% buy few
    7·1 answer
  • Identify three solutions of the inequality x &lt; 1
    6·2 answers
  • Place the vocabulary words on the diagram to correctly identify the opposite, adjacent, and hypotenuse sides of the
    6·1 answer
  • John an architect, used a scale factor of 1 inch = 20 feet to design a site plan. the actual park has been designed to be 18 fee
    9·1 answer
  • Todd Has 3/4 of a pizza. Mary has 6/10 of a pizza. How much do they have together?
    15·2 answers
Add answer
Login
Not registered? Fast signup
Signup
Login Signup
Ask question!