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
Wittaler [7]
3 years ago
7

we choose a sample of size 100 from a population of monthly cable bills having standard deviation $20 If we assume the populatio

n mean bill is $65, what is the probability mean of our sample is greater than $70.
Mathematics
1 answer:
igor_vitrenko [27]3 years ago
8 0

Answer:

0.0062

Step-by-step explanation:

Find the standard error.

σ = 20 / √100

σ = 2

Find the z-score.

z = (x − μ) / σ

z = (70 − 65) / 2

z = 2.5

Find the probability.

P(Z > 2.5) = 1 − 0.9938

P(Z > 2.5) = 0.0062

You might be interested in
How do the expressions 72 / 9 and -72/ (-9) compare when they are evaluated?
Artemon [7]

Answer:

D

Step-by-step explanation:

72/9=8

-72/-9=8 because negative/negative=positive.

7 0
3 years ago
Read 2 more answers
Does anyone know what the inverse function of f(x)=x/x-2 is?
Leto [7]

Answer:

-1 is the answer to that

4 0
3 years ago
Which expression is equivalent to 3m+1-m?
Lisa [10]

Answer:

option  (a) is correct.

2 + m - 1 + m is an equivalent expression  to the given expression  3m+1-m

Step-by-step explanation:

 Given expression  3m+1-m

We have to choose an equivalent expression from given options.

Equivalent expression are those expression that looks different but are same.

Like 4+2 = 6  and 3+ 3 = 6

Both have same value but looks differently.

Like terms are term having same variable with same degree.

Consider the given expression  3m+1-m

Simplify by adding like terms,

3m + 1 - m = (3-1) m + 1

Thus, (3-1) m + 1  = 2m + 1

Also 2m + 1 can be written as m + m + 2 - 1

Thus, option  (a) is correct.

6 0
3 years ago
Read 2 more answers
Solve: 2x+3y=12 6x-y=4
Elis [28]
Answer: x= 6/5 ; y= 16/5

7 0
3 years ago
Read 2 more answers
Does anyone know how to solve this? asap please:((
zheka24 [161]

Answer:

D)

Step-by-step explanation:

All sides are congruent because all sides are the same.

Hope this helps!

<em>-kiniwih426</em>

6 0
3 years ago
Read 2 more answers
Other questions:
  • To assign a double variable d to a float variable x, you write ________. x = (long)d x = (int)d; x = d; x = (float)d;
    13·1 answer
  • How many degrees would you need to rotate a figure for the image to coincide with the pre-image?
    5·1 answer
  • Simplify a b c and d please help
    5·1 answer
  • Find the area of the figure
    14·1 answer
  • Help quick. Need fast. Thx
    8·1 answer
  • Which graph shows the same end behavior as the graph of f(x) = 2x6 - 2x2 - 5?
    13·1 answer
  • A quantity P is an exponential function of time I, such that P = 160 when t = 6 and P = 150 when I = 4. Use the given informatio
    10·1 answer
  • PLEASE HELP !! ILL GIVE BRAINLIEST *EXTRA POINTS*.. <br> IM GIVING 40 POINTS !! DONT SKIP :((.
    7·2 answers
  • Which phrase describes the variable expression z+ 8?
    15·1 answer
  • Is the square root of 3 rational?
    5·1 answer
Add answer
Login
Not registered? Fast signup
Signup
Login Signup
Ask question!