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
Vinil7 [7]
3 years ago
14

Select True or False from each pull-down menu, depending on whether the corresponding statement is true or false.

Mathematics
1 answer:
Nina [5.8K]3 years ago
5 0

Answer:

1) FALSE

2) FALSE

3) TRUE

4) TRUE

Step-by-step explanation:

Previous concepts

Normal distribution, is a "probability distribution that is symmetric about the mean, showing that data near the mean are more frequent in occurrence than data far from the mean".

The Z-score is "a numerical measurement used in statistics of a value's relationship to the mean (average) of a group of values, measured in terms of standard deviations from the mean".  

Part 1

The mean and standard deviation of a normally distributed random variable which has been standardized are one and zero, respectively.

The mean and the deviation for  the normal standard distribution are:

\mu=0, \sigma =1

So then that's FALSE.

Part 2

Using the standard normal curve, the z−score representing the 10th percentile is 1.28.

We are looking for a value a, that satisfy this:

P(X>a)=0.90   (a)

P(X   (b)  

We can find a z value that satisfy the condition with 0.10 of the area on the left and 0.90 of the area on the right it's z=-1.28. On this case P(Z<-1.28)=0.10 and P(Z>-1.28)=0.90

So that's FALSE.

Part 3

Let z1 be a z−score that is unknown but identifiable by position and area. If the symmetrical area between −z1 and +z1 is 0.9544, the value of z1 is 2.0

If we find this probability:

P(-2.0< Z

So on this case we can approximate to 0.9544. And that's TRUE.

Part 4

Using the standard normal curve, the z−score representing the 75th percentile is 0.67.

We are looking for a value a, that satisfy this:

P(X>a)=0.25   (a)

P(X   (b)  

We can find a z value that satisfy the condition with 0.75 of the area on the left and 0.25 of the area on the right it's z=0.67. On this case P(Z<0.67)=0.75 and P(Z>0.67)=0.25

So that's TRUE.

You might be interested in
What is the discounted price of a $500 cell phone with a discount of<br> 10% ?
iren2701 [21]
My answer that I got was $500.00
5 0
3 years ago
An architectural drawing of a building shows the elevation of the basement floor to be –10 feet. The elevation of the roof is 40
m_a_m_a [10]
50 feet

It is 10 feet from -10ft to 0ft, plus 40ft to the roof.
8 0
3 years ago
Carl used 10 2/9 an inch of string to tie a parcel and another 5 1/4 of an inch of string to tie a box, how much string is left
NARA [144]

Answer:

20-(10 2/9)-(5 1/4)= 4.52777777778 inches decimal or 163/36

Step-by-step explanation:

Simplify the following:

20 - (10 + 2/9) - (5 + 1/4)

Put 10 + 2/9 over the common denominator 9. 10 + 2/9 = (9×10)/9 + 2/9:

20 - (9×10)/9 + 2/9 - (5 + 1/4)

9×10 = 90:

20 - (90/9 + 2/9) - (5 + 1/4)

90/9 + 2/9 = (90 + 2)/9:

20 - (90 + 2)/9 - (5 + 1/4)

90 + 2 = 92:

20 - 92/9 - (5 + 1/4)

Put 5 + 1/4 over the common denominator 4. 5 + 1/4 = (4×5)/4 + 1/4:

20 - 92/9 - (4×5)/4 + 1/4

4×5 = 20:

20 - 92/9 - (20/4 + 1/4)

20/4 + 1/4 = (20 + 1)/4:

20 - 92/9 - (20 + 1)/4

20 + 1 = 21:

20 - 92/9 - 21/4

Put 20 - 92/9 - 21/4 over the common denominator 36. 20 - 92/9 - 21/4 = (36×20)/36 + (4 (-92))/36 + (9 (-21))/36:

(36×20)/36 + (4 (-92))/36 + (9 (-21))/36

| 3 | 6

× | 2 | 0

| 0 | 0

7 | 2 | 0

7 | 2 | 0:

720/36 + (4 (-92))/36 + (9 (-21))/36

4 (-92) = -368:

720/36 + (-368)/36 + (9 (-21))/36

9 (-21) = -189:

720/36 - 368/36 + (-189)/36

720/36 - 368/36 - 189/36 = (720 - 368 - 189)/36:

(720 - 368 - 189)/36

720 - 368 - 189 = 720 - (368 + 189):

(720 - (368 + 189))/36

| 1 | 1 |  

| 3 | 6 | 8

+ | 1 | 8 | 9

| 5 | 5 | 7:

(720 - 557)/36

| | 11 |  

| 6 | 1 | 10

| 7 | 2 | 0

- | 5 | 5 | 7

| 1 | 6 | 3:

Answer: 163/36

4 0
3 years ago
Amir arranged 9 photos on a bulletin board. He put the photos in rows. Each row contains the same number of photos. How many pho
Ludmilka [50]

Answer:

I select b, 1,3, or 9 photos as my answer.

7 0
3 years ago
An online ticket seller charges $44 for each ticket ton concert, plus a fixed handling fee of $12. Define the unknown variables
enot [183]

Answer:

x= number of tickets bought

y= total

44x+12=y

8 0
3 years ago
Other questions:
  • #3
    11·1 answer
  • 14. The sum of the digits of a certain two-digit number is 4. When you reverse its digits you decrease the number by 18. What is
    14·1 answer
  • Erica bought 3 1/2 yards of fabric if she uses 2/3 of the fabric how much will she have left?
    12·1 answer
  • What is 3/4 of 3 HALP DUE NOW
    15·2 answers
  • 2% of the students at Hamilton Middle School have red hair. There are 700700 students at Hamilton Middle School. How many studen
    9·1 answer
  • The equation 2 (m - 8) + 3 = 17 has more than one solution method. Give at least two different
    7·2 answers
  • Simplify -2 1/9 - (-4 1/9)
    11·1 answer
  • What is the Greatest Common Factor of the two monomials?<br> 15a²b, 35ab2
    14·1 answer
  • Trena's jump rope is 3.5 feet
    5·1 answer
  • Please help i don't understand! please i need this
    10·1 answer
Add answer
Login
Not registered? Fast signup
Signup
Login Signup
Ask question!