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Artist 52 [7]
3 years ago
14

Find the five arithmetic means between -18 and 36

Mathematics
1 answer:
Andreas93 [3]3 years ago
5 0
Yeah it really be like that sometimes, you gotta try girl
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If (w+13)^2=(3w+7)(2w+4), find w^2. Express your answer as a decimal.
faltersainse [42]
Answer: w² equals to 28.2
4 0
3 years ago
A bag contains 5 red marbles, 8 blue marbles and 6 green marbles. If three marbles are drawn out of the bag, what is the probabi
Gala2k [10]

70000000000 + 8818282828828

8 0
3 years ago
In an examination of purchasing patterns of shoppers, a sample of 16 shoppers revealed that they spent, on average, $54 per hour
Lesechka [4]

Answer:

54-1.64\frac{21}{\sqrt{16}}=45.39    

54 +1.64\frac{21}{\sqrt{16}}=62.61    

So on this case the 90% confidence interval would be given by (45.39;62.61)    

Step-by-step explanation:

Previous concepts

A confidence interval is "a range of values that’s likely to include a population value with a certain degree of confidence. It is often expressed a % whereby a population means lies between an upper and lower interval".

The margin of error is the range of values below and above the sample statistic in a confidence interval.

Normal distribution, is a "probability distribution that is symmetric about the mean, showing that data near the mean are more frequent in occurrence than data far from the mean".

\bar X=54 represent the sample mean  

\mu population mean (variable of interest)

\sigma=21 represent the sample standard deviation

n=16 represent the sample size  

Solution to the problem

The confidence interval for the mean is given by the following formula:

\bar X \pm z_{\alpha/2}\frac{\sigma}{\sqrt{n}}   (1)

Since the Confidence is 0.90 or 90%, the value of \alpha=1-0.9=0.1 and \alpha/2 =0.05, and we can use excel, a calculator or a table to find the critical value. The excel command would be: "=-NORM.INV(0.05,0,1)".And we see that z_{\alpha/2}=1.64

Now we have everything in order to replace into formula (1):

54-1.64\frac{21}{\sqrt{16}}=45.39    

54 +1.64\frac{21}{\sqrt{16}}=62.61    

So on this case the 90% confidence interval would be given by (45.39;62.61)    

4 0
3 years ago
Write two different word phrases for the expression (52+8) 30
zepelin [54]

Answer:

1. The product of thirty and eight more than fifty-two.

2. Thirty times the sum of eight and fifty-two

Step-by-step explanation:

 1) 52+8 (eight more the fifty-two )

      52+8 (The product of thirty and eight more than fifty-two.)

       

2) 52+8 (The sum of eight and fifty-two)

     52+8 (Thirty times the sum of eight and fifty-two)

3 0
3 years ago
Read 2 more answers
Evaluate 5+ (-11) - (-11)
SOVA2 [1]

Answer:

5

Step-by-step explanation:

To solve a problem with negatives, we use the following rule.

If it is like

x+(-y), it is equivalent to x-y

If the equation is like

(-x)-(-y), it is equivalent to (-x)+y

So,

5+(-11)=5-11=-6

(-6)-(-11)=(-6)+11=5

Your answer is 5.

7 0
3 years ago
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