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
SpyIntel [72]
3 years ago
7

Given the mean of a random variable, X, is 10 and P(X < 11) = 0.67. Find the standard deviation.

Mathematics
1 answer:
Taya2010 [7]3 years ago
4 0

Answer:

Step-by-step explanation:

This is the problem we need to solve:

z=\frac{x_i-\bar{x}}{\sigma} and we have everything but the z-score (which we find from a table) with our main unknown being the standard deviation.

If the probability that a random variable that is less than 11 is .67, we first have to find the z-score from the table that is closest to .67, and there are 2:

P(z < .43) = .66640 and P(z < .44) = .67003

We'll use z = .44

.44=\frac{11-10}{\sigma} and

.44=\frac{1}{\sigma} and

\sigma=\frac{1}{.44} so

σ = 2.27 (check it; it works!)

You might be interested in
Estimate show how you estimated 512 divided by 52
Bond [772]
52 = 50

512= 500

500/50 = 10
4 0
3 years ago
Select the answer choice that is equivalent to the expression given belon.
uranmaximum [27]

Answer:

23x - 10

Step-by-step explanation:

To the find the equivalent of 9(2x - 3) + 5x + 17, evaluate the expression. Start by opening the bracket.

9*2x - 9*3 + 5x + 17

18x - 27 + 5x + 17

Pair like terms

18x + 5x - 27 + 17

23x - 10

The equivalent of 9(2x - 3) + 5x + 17 is 23x - 10

6 0
3 years ago
If the test for a disease is accurate 82% of the time, how often will it come back negative if a patient has the disease?
aniked [119]
Would it just be 100 - 82 = 18, so D maybe?
4 0
3 years ago
Read 2 more answers
How does this polynomial identity work on numerical relationships?<br> (y + x) (ax + b)
Serggg [28]

Let us take 'a' in the place of 'y' so the equation becomes

(y+x) (ax+b)

Step-by-step explanation:

<u>Step 1:</u>

(a + x) (ax + b)

<u>Step 2: Proof</u>

Checking polynomial identity.

(ax+b )(x+a) = FOIL

(ax+b)(x+a)

ax^2+a^2x is the First Term in the FOIL

ax^2 + a^2x + bx + ab

(ax+b)(x+a)+bx+ab is the Second Term in the FOIL

Add both expressions together from First and Second Term  

= ax^2 + a^2x + bx + ab

<u>Step 3: Proof </u>

(ax+b)(x+a) = ax^2 + a^2x + bx + ab

Identity is Found .

Trying with numbers now

(ax+b)(x+a) = ax^2 + a^2x + bx + ab

((2*5)+8)(5+2) =(2*5^2)+(2^2*5)+(8*5)+(2*8)

((10)+8)(7) =(2*25)+(4*5)+(40)+(16)

(18)(7) =(50)+(20)+(56)

126 =126

3 0
3 years ago
Karina is designing a logo on a coordinate plane. The logo is a square whose area is 200 square units. She places a circle in th
snow_lady [41]

Answer: 66%

Step-by-step explanation:

I took the test on khan.

4 0
3 years ago
Other questions:
  • Can you answer the bottom problem please
    10·1 answer
  • What <br>is 1/10 of .04​
    6·2 answers
  • There are 7 ducks swimming in a pond. If 3 have green wings and 4 have blue wings, what fraction of the ducks have green wings?
    15·2 answers
  • Apply the distributive property to create an equivalent expression.<br> 2(3-8y)= (awnser)
    15·2 answers
  • Use (&lt;, &gt;, =) to compare 2⁄3 and 3⁄4.
    12·1 answer
  • How do I evaluate each using the values given
    9·1 answer
  • Suppose your parents started saving for your college education when you were 5 years old. Assume they saved $300 the first year,
    8·1 answer
  • A house was purchased for $89,000. After 6 years the value of the house was $101,000. Find a linear equation that models the val
    6·1 answer
  • URGENTT!!!!!!!
    6·1 answer
  • Help me wit dis question I’ll give you brainliest
    15·2 answers
Add answer
Login
Not registered? Fast signup
Signup
Login Signup
Ask question!