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Gnom [1K]
3 years ago
13

Identify the type of sampling (cluster, convenience, random, stratified, systematic) which would be used to get each of the foll

owing samples: (a) For a period of two days measure the length of time each fifth person coming into a bank waits in line for teller service. (b) Take a random sample of five zip codes from the Chicago metropolitan region and count the number of students enrolled in the first grade for every elementary school in each of the zip code areas. (c) Divide the users of the Internet into different age groups and then select a random sample from each age group to survey about the amount of time they spend on the Internet each month. (d) Survey five friends regarding their opinion about the quality of food in the student cafeteria. (e) Pick a random sample of students enrolled at your college and determine the number of credit hours they have each accumulated toward their degree program.
Mathematics
1 answer:
loris [4]3 years ago
6 0
A) systematic
B) cluster
C) stratified
D) convenience
E) random

If you need explanation, just let me know!
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Suppose that a box contains 8 cameras and that 4 of them are defective. A sample of 2 cameras is selected at random. Define the
maria [59]

Answer:

P(x) = 8Cx * p^x * (1 - p)^(8 - r) ; r = 0, 1, 2

Step-by-step explanation:

Given that:

Total Number of cameras (n) = 8

Defective cameras = 4

X: number of defective cameras

For a binomial distribution :

P(x) = nCx * p^x * (1 - p)^(n - x)

Probability of success (p) on each trial is the same = (total number of samples / number of defective samples) = 8/4 = 0.5

If 2 samples are chosen at random :

Then, the binomial probability distribution will be :

P(x) = 8Cx * p^x * (1 - p)^(8 - r) ; r = 0, 1, 2

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Elena has 14 pieces of bannana bread. She gives an equal amount of bannana bread to 4 friends. How many peices of bannana bread
Mashutka [201]

You have to divide the 14 pieces amongst 4 friends: 14/4. This can be simplified into a fraction. Since both the numerator and denominator can be divided by 2, you can simplify the fraction to 7/2 and make it into a mixed number 3 1/2, or decimal form 3.5. Each friend got three and a half pieces of banana bread.

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3 years ago
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10,9,8,7......
Charra [1.4K]

Answer:

30th term of the sequence is -19

Step-by-step explanation:

first term = 10

common difference = 9- 10 = -1

so, nth term = a + (n-1) d

( where n is number of term, a = first term ,

d = common difference. )

  • 30th term = 10 + (30-1) × -1
  • 30th term = 10 - 29
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<em>i</em><em> </em><em>hope</em><em> </em><em>it</em><em> </em><em>helped</em><em>.</em><em>.</em><em>.</em>

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Find the area of the top ( circle) then multiply by the height.

Area = pi x r^2

Area = pi x 7^2

Area = 49pi

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