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
ElenaW [278]
3 years ago
10

Assume the random variable X is normally distributed with mean 53 and standard deviation of 6. Find the 9th percentile

Mathematics
1 answer:
satela [25.4K]3 years ago
6 0

Answer:

<em>The 9th percentile of X is 44.96</em>

Step-by-step explanation:

<u>Percentiles for a Normal Distribution</u>

The standard normal distribution can be used for computing percentiles. For example, the median is the 50th percentile being the center value, the first quartile is the 25th percentile, and so on.

To compute percentiles of a normal distribution we can use the formula

X=\mu+z\sigma

Where \mu is the mean, \sigma is the standard deviation of the variable X, and z is the z-score value from the standard tables

The value of X can also be directly obtained from digital tables included in math packages and tools like Excel.

The Excel NORM.INV Function calculates the inverse of the cumulative Normal Distribution Function for a given value of p, \mu and \sigma.

We'll use the values

p=9\%=0.09,\ \mu=53, \ \sigma=6

NORM.INV(0.09,53,6) results in 44.96 which means the 9th percentile of X is 44.96

We could have used the standard normal distribution, which only needs the value of p

NORM.S.INV( 0.09 )=-1.34

That is the value of z, we now apply the formula

X=\mu+z\sigma

X=53+(-1.34)\cdot 6=44.96

We get the very same result as before

You might be interested in
Eight less than seven times a number is six find the number
Leokris [45]

Answer:

2

Step-by-step explanation:

let the number be n , then

7n - 8 = 6 ( add 8 to both sides )

7n = 14 ( divide both sides by 7 )

n = 2

The number is 2

4 0
2 years ago
Read 2 more answers
I need help -6x&lt;-18 or x+45-1
Basile [38]

1. x>3

2. x+44

mathpapa" is a great resource for step by step equation solving.

6 0
3 years ago
A second hand car was sold for $190000,at a loss of $85.find the CP of the car
Zigmanuir [339]
The answer is 300

hope his s helps
5 0
3 years ago
How much fibre does the NHS recommend adults take in as a daily dose?
iVinArrow [24]

Answer:

The answer is D: 30 g.

Step-by-step explanation: I googled the answer to this question and it said that NHS reccomends that adults take around 30 g of fibre as a daily dose. If you take less, you may not get enough, but if you take more, you would possibly overdose. So, the answer is D: 30g.

8 0
3 years ago
What is the greatest whole number that rounds to 621,860
Nastasia [14]
You didn't say how you are rounding.If its to the near multiple of 10, the answer is 621,864.
6 0
3 years ago
Other questions:
  • Jan needed to empty 18 gallons of water from a tub into jugs that hold 0.5 gallons of water. How many jugs did Jan need?
    14·1 answer
  • A 12-inch candle is lit and steadily burns until it is burned out. As the burned length of the candle increases from 4 to 7.5 in
    10·1 answer
  • Which of the following equations is equivalent to y=2^x?
    8·2 answers
  • The Questions above.
    8·1 answer
  • Determine the degree of the following polynomial: - 4x + 10
    7·1 answer
  • Solve x for 7× + 3 = 31​
    13·2 answers
  • Answer in number 6 plssss
    5·1 answer
  • Help!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!
    11·1 answer
  • Last year, Alaska saw 48 inches of snow during the winter. This year, Alaska saw 75 inches of snow during the winter. By what pe
    6·2 answers
  • A family-size container of trail mix contains 40 ounces. This is 250% of the amount in the regular-size container.
    9·1 answer
Add answer
Login
Not registered? Fast signup
Signup
Login Signup
Ask question!