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
Do you think it would be difficult to convert between the English Customary System and the Metric System? For example, if I want
tester [92]

Answer:

1 pound is 453.6 grams appox

Step-by-step explanation:

to calculate how many grams is 2 pounds, u can do 2x453.6 which would be 907.2

for all others i have an attached file :)

7 0
2 years ago
I need help with this please!!
Wewaii [24]

Answer:

-5 would Be your answer

Step-by-step explanation:

5 0
2 years ago
The last time Sierra played softball, she hit the ball 45% of the times she was at bat. Based on this information, how many time
Ymorist [56]

Answer:

Number of times she will hit the ball  the next time she plays softball if she is at bat 20 times = 9 times

Step-by-step explanation:

Percentage of times Sierra hit the ball when she was at bat playing softball= 45%

So, we can find:

Number of times she will hit the ball  the next time she plays softball if she is at bat 20 times = \textrm{45\% of 20 times} =0.45\times 20=9\ times

3 0
3 years ago
Write down the next decimal number. 0,79; 0,76; 0,73; 0,7; ___​
ycow [4]

Answer:

0.69

Step-by-step explanation:

Hope this helps..

3 0
2 years ago
Mark uses an app that shows him how many kilometers he has run to prepare for a marathon. The app said he ran 9.654 kilometers.
Viefleur [7K]

Answer:

5.9987174899

Step-by-step explanation:

9.654km / 1.609344

= 5.9987174899mi

4 0
2 years ago
Other questions:
  • Which one is larger 1.0 or 1.03
    6·2 answers
  • An athlete's speed on her bike is 14mph faster than her average speed running. She can bike 31.5 miles in the same time that it
    14·1 answer
  • What does a persuasive visual designed to make an argument refer to a. visual rhetoric b. logos c. pathos
    5·2 answers
  • When a number is increased by 9.5%, the result is 58. What is the original number to the nearest tenth?
    8·2 answers
  • How to do this cause I am confused
    5·1 answer
  • 3.The legs of a right triangle are equal. Given the length of the legs, find the length of the hypotenuse. Round
    5·1 answer
  • When you use a paint can opener to a can of paint you use the paint can opener as a simple machine called a _____ class______
    9·1 answer
  • PLLLLLLEEEEEEEEZZZZZZZZZ AAAAAANNNNSSSSSEEEEERRRRRR will give brainlist! One million dollars! A megayacht! FIVE STARS!
    14·2 answers
  • Find the 12th term.<br> t(11) = 8<br> t(n + 1) = t(n) - 3
    11·1 answer
  • In a few sentences, describe what this weather map tells you about the weather.
    15·1 answer
Add answer
Login
Not registered? Fast signup
Signup
Login Signup
Ask question!