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aniked [119]
3 years ago
6

Mr. Lew recorded the average length, in minutes, of phone calls received at work. He recorded the data in the box plots below.

Mathematics
1 answer:
Yakvenalex [24]3 years ago
6 0
C because it’s the best choice out of the four
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What is the mode for the following set of numbers 1,1,2,2,2,3,3,4
aleksklad [387]
Mode = 2
hope it helps
----------------------------
5 0
2 years ago
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A simple random sample of 100 observations was taken from a large population. The sample mean and the standard deviation were de
olga2289 [7]

Answer:

Se=1.2

Step-by-step explanation:

The standard error is the standard deviation of a sample population. "It measures the accuracy with which a sample represents a population".

The central limit theorem (CLT) states "that the distribution of sample means approximates a normal distribution, as the sample size becomes larger, assuming that all samples are identical in size, and regardless of the population distribution shape"

The sample mean is defined as:

\bar X =\frac{\sum_{i=1}^n x_i}{n}

And the distribution for the sample mean is given by:

\bar X \sim N(\mu,\frac{\sigma}{\sqrt{n}})

Let X denotes the random variable that measures the particular characteristic of interest. Let, X1, X2, …, Xn be the values of the random variable for the n units of the sample.

As the sample size is large,(>30) it can be assumed that the distribution is normal. The standard error of the sample mean X bar is given by:

Se=\frac{\sigma}{\sqrt{n}}

If we replace the values given we have:

Se=\frac{12}{\sqrt{100}}=1.2

So then the distribution for the sample mean \bar X is:

\bar X \sim N(\mu=80,Se=1.2)

5 0
2 years ago
A boat costs $11,850 and decreases in value by 10% per year. How much will the boat be worth after 8 years?
arsen [322]
11,850 x .9 = 11,605  

11605 x . 9 = 9,598.5       year 2 

9,598.5 x .9 = 8,638.65

8,635 x .9 = 7,774.785       year 4

7,774.785 x .9 = 6,997.31

6,6997.31 x .9 = 6297.58     year 6 

6297.58 x .9 = 5,667.82 

5,667.82 x .9 = 5,101.04 year 8 

The answer is D 






8 0
2 years ago
Read 2 more answers
What is the conjugate of the product (2 - i)(1+2i)?
ivann1987 [24]

Answer:

4-3i is the answer.......

Explanation

<u>Product</u>

(2-i)(1+2i) = 2+4i-i-2i²

= 2+4i-i+2

= 4+3i

conjugate of 4+3i is 4-3i

8 0
3 years ago
What is 56.398 rounded to the nearest tenth
Ratling [72]

The decimal place to the right of the tenths place is the hundredths place. The digit in that place is 9.

When the digit to the right of the place you're rounding to is more than 4, you increase the digit in the rounding place by 1.

Here, we have the hundredths digit is 9, which is more than 4, so we increase the tenths digit by 1. The rounded number is

... 56.4

_____

Another way to get there is to add 5 in the hundredths place (the place to the right of the one you're rounding to). When you do that, you get 56.448. Now, throw away all the digits to the right of the one you're rounding to. This leaves

... 56.4

_ _ _ _ _ _ _

The reason I show this last method is to deal with cases like rounding 56.978. By the first rule, you're increasing the digit 9 by 1, which might be confusing. (it requires a carry into the next digit, making 57.0.) If you add .05 to this number, you get 56.978 +.05 = 57.028. Now when you throw away the digits to the right of the tenths digit, you have 57.0.

4 0
3 years ago
Read 2 more answers
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