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Bad White [126]
3 years ago
8

A distribution of test scores is not symmetric. Which of the following is the best estimate of the z-score of the third quartile

?
a. 0.67
b. 0.75
c. 1.00
d. 1.41
e. this z-score cannot be estimated from the information given.
Mathematics
1 answer:
sweet-ann [11.9K]3 years ago
8 0

The correct answer is:

e. this z-score cannot be estimated from the information given.

Further explanation:

Let us define z-score first:

"Z-score is the measurement of how many standard deviations a data value is from mean"

We are given that the distribution is not symmetric. And to find the z-score of any value in the data we at least need to know the mean and standard deviation of the given distribution which is not available. So we can conclude that the z-score of third quartile cannot be estimated from given information.

So, e. this z-score cannot be estimated from the information given is the correct answer.

Keywords: Symmetric distribution, z-score

Learn more about Non-symmetric distribution at:

  • brainly.com/question/4625002
  • brainly.com/question/6013254

#LearnwithBrainly

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Daisy invests a total of $12900 in two accounts. One account pays 9% annual interest and the other pays 8% annual interest. If t
soldier1979 [14.2K]

Answer:

The equations:

x + y = 12900\\.09x + .08y = 1103

the value for x and y:

x  = 7100\\y = 5800

Step-by-step explanation:

invest amount = 12900

let x = amount put into the first account

let y = amount put into the second account

we know the sum of of  both is 12900, thus

x + y = 12900

We also know the sum of their annual interest rate is 1103

.09x + .08y = 1103

Thus the equations needed are

x + y = 12900 and .09x + .08y = 1103

To find the values for x and you know have all equations you need

we need to get this equation .09x + .08y = 1103 to a single variable

we can do this using x or y, lets use x

we know

x + y = 12900, so

x = 12900 - y

lets plug x = 12900 - y into .09x + .08y = 1103

.09(12900 - y) + .08y = 1103

1161 - .09y + .08y = 1103

-.01y = -58

y = 5800

we can get x from this equation x = 12900 - y from above

x = 12900 - 5800\\x  = 7100

4 0
3 years ago
Use the properties of logarithms to prove log81000= log210.
Liula [17]

Answer:

Step-by-step explanation:

Given the expression log_81000 = log_210, to prove this expression is true using the properties of logarithm, we will follow the following steps.

Starting from the Left Hand Side:

<h3>log_81000\\</h3><h3>= log₈ 10³</h3><h3>= log_ 2^3 (10³)</h3><h3 /><h3>= log₂10</h3>
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gia is thinking of a number which she calls n. She adds 4 to the number and then doubles the sum. Write an expression to represe
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alex41 [277]

The Simplification of the following expression is;

  • m = -30/7
  • v = -8.8
  • x = 3
  • u = -2.49
  • a = -3/70

<h3>Simplification</h3>

7/8m - 4/7 - 5/6m = - 3/4

7/8m - 5/6m = -3/4 + 4/7

21m-20m/24 = -21+16/28

1/24m = -5/28

m = -5/28 ÷ 1/24

= -5/28 × 24/1

= -120/28

m = -30/7

4.3v + 10.75 - 4v = 8.11

0.3v = 8.11 - 10.75

0.3v = -2.64

v = -2.64/0.3

v = -8.8

9/7 + 9/7x - 6/7x =0

9/7x - 6/7x = - 9/7

(9-6)x /7 = 9/7

3/7x = 9/7

x = 9/7 ÷ 3/7

= 9/7 × 7/3

= 9/3

x = 3

6.9u - 2 - 3.2u - 10 = 2.8

3.7u = 2.8 - 12

3.7u = -9.2

u = -9.2/3.7

u = -2.49

8/5 = - 4a + 7/5 - 2/3a

8/5 - 7/5 = -4a - 2/3a

8-7/5 = -12a-2a/3

1/5 = -14/3a

a = 1/5 ÷ -14/3

= 1/5 × -3/14

a = -3/70

Learn more about simplification:

brainly.com/question/723406

#SPJ1

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2 years ago
The midpoint of PQ is M(, –1). One endpoint is Q(3, –5). Which equations can be solved to determine the coordinates of P? Check
valkas [14]

<u>Comment</u>

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