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
jarptica [38.1K]
3 years ago
12

Given that X ~ N(120, 35). We survey samples of 25 and are interested in the distribution of X-bar. Find the z-score associated

with x-bar = 100.
a. -14.2857
b. -20/35
c. -2.8571
d. -20
Mathematics
1 answer:
lubasha [3.4K]3 years ago
8 0

Answer:

Option c -2.8571

Step-by-step explanation:

z-score are calculated as

z=\frac{xbar-mean}{\frac{S.D}{\sqrt{n} } }.

We are given that mean=120 and standard deviation=S.D=35 as X~N(120,35).

Sample size=n=25.

We have to find z-score for x-bar=100. So,

z-score=[100-120]/[35/√25]

z-score=[-20]/[35/5]

z-score=-20/7

z-score=-2.8571.

Thus,  the z-score associated with x-bar = 100 is -2.8571.

You might be interested in
Which expression is equivalent to the following expression? 10x + 3(8 - 7x)
Paladinen [302]
It is -11x + 24 because you multiply the numbers in the parentheses by 3 then collect like terms 10x +24 - 21x then you do 10x minus 24x and you get -11x+24
7 0
3 years ago
Can you help me please​
kotegsom [21]

Answer:

3

Step-by-step explanation:

3 0
3 years ago
Read 2 more answers
A pack of 5 smiley stickers cost $6.50. What is the unit price?
nika2105 [10]

Answer:

$1.30

Step-by-step explanation:

4 0
3 years ago
Before Nina bought groceries on April 22, she had a balance of $487.25 in her checking account. Nina wrote her transactions in h
Amiraneli [1.4K]

Answer: 429.75

Step-by-step explanation: i did it before

6 0
3 years ago
Read 2 more answers
A gumball machine contains 23 green gumballs, 52 red gumballs, 34 blue gumballs, 61 yellow gumballs, and 30 pink gumballs. What
Veseljchak [2.6K]
52% of 200
52/100=26/50=13/25•200/1= 2600/25=2600 divided by 25 is 104
The answer is 104
7 0
3 years ago
Read 2 more answers
Other questions:
  • 2h=w-3p<br> What does p equal?
    10·2 answers
  • -X2 - x + 42
    9·1 answer
  • The graph of f(x) = x^2 has been shifted into the form f(x) = (x − h)^2 + k
    14·1 answer
  • Name the three dimensional figure that is formed by folding the net
    11·2 answers
  • A firm wishes to maintain an internal growth rate of 7.1 percent and a dividend payout ratio of 25 percent. The current profit m
    9·1 answer
  • Determine the intercepts of the line.
    13·2 answers
  • Need help on these questions ASAP DUE TOMORROW PLEASE
    13·1 answer
  • What is the simplified value of the expression below? -2.6+5.8
    14·2 answers
  • Veuillez m’aider s’il vous plaît à résoudre cette question merci !
    9·1 answer
  • Iain serves 3 cups of coffee every 4 minutes.
    5·1 answer
Add answer
Login
Not registered? Fast signup
Signup
Login Signup
Ask question!