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Svet_ta [14]
3 years ago
11

How much will the hardwood floor cost?

Mathematics
1 answer:
Genrish500 [490]3 years ago
3 0
I dont see anything...........
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A radio station claims that the amount of advertising per hour of broadcast time has an average of 13 minutes and a standard dev
zimovet [89]

Answer:

Z = 3.33

Step-by-step explanation:

Z-score:

In a set with mean \mu and standard deviation \sigma, the zscore of a measure X is given by:

Z = \frac{X - \mu}{\sigma}

The Z-score measures how many standard deviations the measure is from the mean. After finding the Z-score, we look at the z-score table and find the p-value associated with this z-score. This p-value is the probability that the value of the measure is smaller than X, that is, the percentile of X. Subtracting 1 by the pvalue, we get the probability that the value of the measure is greater than X.

In this question:

\mu = 13, \sigma = 1.2

You listen to the radio station for 1​ hour, at a randomly selected​ time, and carefully observe that the amount of advertising time is equal to 17 minutes. Calculate the​ z-score for this amount of advertising time.

We have to find Z when X = 17. So

Z = \frac{X - \mu}{\sigma}

Z = \frac{17 - 13}{1.2}

Z = 3.33

5 0
3 years ago
What is the ratio of 6:21?
VMariaS [17]
That is a ratio. If you mean the simplified version, then 2:7
6 0
2 years ago
Which statement most accurately describes what happens when a bar of chocolate melts? A. A physical change takes place that caus
wariber [46]

Answer:

(B). A physical change takes place that causes molecules to move faster

Step-by-step explanation:

When a bar of chocolate melts its physical form is changed, there is no difference in its chemical composition as it is still same.

When the chocolate bar was frozen its molecules were held strongly, and they were barely moving, whereas when it melts the molecules are more free to move now.

5 0
2 years ago
What gradient is shown in the graph
Lelu [443]

Answer:

-2/1 or -2

Step-by-step explanation:

in an equation this would be y=-2x-3

5 0
2 years ago
The ratio of boys to girls is 5:3 there are 80 more boys than girls how many girls are there
shtirl [24]

Answer: 120

<u>Step-by-step explanation:</u>

              Ratio      Quantity

Boys:        5           80 + x                  

Girls:         3              x

                 \dfrac{5}{3}=\dfrac{80+x}{x}\\\\\\5x=3(80+x)\\\\5x=240+3x\\\\2x=240\\\\x=120

         

5 0
2 years ago
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