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notka56 [123]
3 years ago
9

A ___ is obtained by dividing the population into groups and selecting all individuals from within a random sample of the groups

.
Mathematics
1 answer:
makkiz [27]3 years ago
4 0

Answer:

cluster

Step-by-step explanation:

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SOLVE EQUATION<br><br> solve for x<br><br> | 3x+19 | =13<br> (absolute value)
egoroff_w [7]

Answer:

x=-2 and -32/3

Step-by-step explanation:

|3x+19|=13

3x+19=13 and 3x+19=-13

x=-2 and x=-32/3

8 0
2 years ago
Read 2 more answers
There were a total of 800 novels and nonfiction books at a book shop. 2/5 of these books were novels. Each novel was priced at $
lutik1710 [3]

Answer:

$1800

Step-by-step explanation:

Total books = 800

Novels Books = 800*2/5 = 320

Nonfiction Books = 800-320= 480

No. of books sold

Novels Books = 320*3/8= 120

Nonfiction Books = 480*2/5 = 192

Total Amount = 120*7 + 192*5

Total Amount = 840 + 960

Total Amount = 1800

Thus total $1800 money the owner of the book shop will make.

8 0
3 years ago
Solve for the variable <br> 10 + 25a = 75<br><br><br><br><br><br> Please help
Vesnalui [34]

Answer:

a = 2.6

Step-by-step explanation:

10 + 25a = 75

- 10.             - 10

25a = 65

÷25.     ÷25

a = 2.6

HOPE THIS HELPS

PLZZ MARK BRAINLIEST

8 0
3 years ago
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The time between arrivals of customers at an automatic teller machine is an exponential random variable with a mean of 4 minutes
andre [41]

Answer:

0.7788 = 77.88% probability that more than three customers arrive in 10 minutes

Step-by-step explanation:

Exponential distribution:

The exponential probability distribution, with mean m, is described by the following equation:

f(x) = \mu e^{-\mu x}

In which \mu = \frac{1}{m} is the decay parameter.

The probability that x is lower or equal to a is given by:

P(X \leq x) = \int\limits^a_0 {f(x)} \, dx

Which has the following solution:

P(X \leq x) = 1 - e^{-\mu x}

The probability of finding a value higher than x is:

P(X > x) = 1 - P(X \leq x) = 1 - (1 - e^{-\mu x}) = e^{-\mu x}

In this question, we have that:

The time between arrivals of customers at an automatic teller machine is an exponential random variable with a mean of 4 minutes, and we have three customers, which means that m = 3*4 = 12, \mu = \frac{1}{12} = 0.0833

(a) What is the probability that more than three customers arrive in 10 minutes

This is P(X > 3). So

P(X > 3) = e^{-0.0833*3} = 0.7788

0.7788 = 77.88% probability that more than three customers arrive in 10 minutes

6 0
3 years ago
Please solve these hjgh
Kruka [31]

Answer:

  1. BDA
  2. ACD
  3. QBO

Step-by-step explanation:

BRO,HOW TO UPLOAD PDG

7 0
3 years ago
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