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
yan [13]
3 years ago
15

A random sample of size 100 was taken from a population. A 94% confidence interval to estimate the mean of the population was co

mputed based on the sample data. The confidence interval for the mean is: (107.62, 129.75). What is the z-value that was used in the computation. Round your z-value to 2 decimal places. Select one: A. 1.45 B. 1.55 C. 1.73 D. 1.88 E. 1.96 E-mail fraud (phishing) is becoming an increasing problem for users of the internet. Suppose that 70% of all internet users experience e-mail fraud. If 50 internet users were randomly selected, what is the probability that no more than 25 were victims of e-mail fraud? Answer:
Mathematics
1 answer:
Firlakuza [10]3 years ago
7 0

Answer:

Step-by-step explanation:

1) The z value was determined using a normal distribution table. From the normal distribution table, the corresponding z value for a 94% confidence interval is 1.88

The correct option is D

2) if 70% of all internet users experience e-mail fraud. It means that probability of success, p

p = 70/100 = 0.7

q = 1 - p = 1 - 0.7 = 0.3

n = number of selected users = 50

Mean, u = np = 50×0.7 = 35

Standard deviation, u = √npq = √50×0.7×0.3 = 3.24

x = number of internet users

The formula for normal distribution is expressed as

z = (x - u)/s

We want to determine the probability that no more than 25 were victims of e-mail fraud. It is expressed as

P(x lesser than or equal to 25)

The z value will be

z = (25- 35)/3.24 = - 10/3.24 = -3.09

Looking at the normal distribution table, the corresponding z score is 0.001

P(x lesser than or equal to 25) = 0.001

You might be interested in
Madeline needs to find the slope of the line that passes through the points (9, 12) and (7, 4). She sets up the following work:
Over [174]

Answer:

No

Step-by-step explanation:

She has everything correct but one thing. In order to have her answer correct, she must put the 9 in front of the 7 because the bigger number needs to go in front.

4 0
3 years ago
Explain answer ! <br><br> Will give brainlst
Ne4ueva [31]

Answer:

x = 4, y = 2

Step-by-step explanation:

Start by multiplying the first equation by 2:

2x + 2y = 12 --> 4x + 4y = 24

Subtract the second from the first:

   4x + 4y = 24

-   5x + 4y = 28

4x - 5x = -x

4y = 4y = 0

24 - 28 = -4

so you end with -x + 0 = -4

Solve for x to get x = 4

Plug x = 4 back into 2x + 2y = 12 to find y.

2(4) + 2y = 12

8 + 2y = 12

2y = 4

y = 2

5 0
3 years ago
Aaron bought a bagel and 3 muffins for $7.25. Bea bought a bagel and 2 muffins for $6. How much is a bagel and how much is a muf
Valentin [98]
The muffin is 1.25
The bagel is 3.50
You get this by seeing the first person bought 3 muffins and 1 bagel.
The second vought only 1 muffin less, so subtract the 2 totals and that gives you the difference which is the price of the muffin
3 0
3 years ago
I will give brainliest
Natasha_Volkova [10]

Answer:

  • 225°
  • quadrant 3
  • reference angle of 45°

Step-by-step explanation:

585-360= 225

225° is in quad 3

reference angle for quad 3 is

225° - 180°

3 0
3 years ago
Read 2 more answers
When is it helpful to convert from point-slope to slope-intercept form?
Lena [83]

Answer:

Point slope form is to find the coordinates of the point on the line, whereas slope intercept gives you the slope plus y-intercept

Step-by-step explanation:

5 0
3 years ago
Other questions:
  • Hello there can you please help me posted picture of question
    13·1 answer
  • if 3 ounces of powdered milk make 1 quart of milk, use a proportion to find how many quarts of milk can be made from 20 ounces o
    8·1 answer
  • Ben bought 4 pairs of jeams and a tshirt that cost 7 he had a cupon for 3 off the price of each pair of jeans amd spent a total
    10·1 answer
  • I don't understand ratios.Please will someone explain them?
    10·2 answers
  • Translate this phrase into an algebraic expression. 62 less than twice a number Use the variable n to represent the unknown numb
    14·1 answer
  • Montell is 30 years younger than his mother. in 5 years, montell age will be 1-3 of his mother’s age. find montell mother’s age
    9·1 answer
  • The height above ground (in feet) of a projectile is given by the function h(t)=-16t^2+64t+10, where t is the number of seconds
    8·1 answer
  • Find the surface area of the cylinder. Use 3.14 for P.
    11·1 answer
  • PLEASE HELP FAST!!
    7·1 answer
  • NUMBER 2 AND 3. GIVING BRAINLIEST!!
    15·2 answers
Add answer
Login
Not registered? Fast signup
Signup
Login Signup
Ask question!