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lys-0071 [83]
3 years ago
7

Heyyyy are you good at word problems? Well you will get 20 points if you get this correct

Mathematics
1 answer:
ad-work [718]3 years ago
4 0

Answer:

$14.5

Step-by-step explanation:

Add 3 3/5 to 11 9/10 and then subtract that number from 30 giving you your qnwsee of $14.5

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in one region, the September energy consumption levels for single-family homes are found to be normally distributed with a mean
VARVARA [1.3K]

Answer:

a=1050 -0.126*218=1022.53

So the value of height that separates the bottom 45% of data from the top 55% is 1022.53.  

Step-by-step explanation:

Previous concepts

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".

The Z-score is "a numerical measurement used in statistics of a value's relationship to the mean (average) of a group of values, measured in terms of standard deviations from the mean".  

Solution to the problem

Let X the random variable that represent the energy consumption of a population, and for this case we know the distribution for X is given by:

X \sim N(1050,218)  

Where \mu=1050 and \sigma=218

For this part we want to find a value a, such that we satisfy this condition:

P(X>a)=0.55   (a)

P(X   (b)

Both conditions are equivalent on this case. We can use the z score again in order to find the value a.  

As we can see on the figure attached the z value that satisfy the condition with 0.45 of the area on the left and 0.55 of the area on the right it's z=-0.126. On this case P(Z<-0.126)=0.45 and P(z>-0.126)=0.55

If we use condition (b) from previous we have this:

P(X  

P(z

But we know which value of z satisfy the previous equation so then we can do this:

z=-0.126

And if we solve for a we got

a=1050 -0.126*218=1022.53

So the value of height that separates the bottom 45% of data from the top 55% is 1022.53.  

8 0
2 years ago
Please answer question b.
ser-zykov [4K]
It is 10.l; Divide 1000 by 93 1/2 and you get 10.6951872... which is a really long decimal, but keep in mind they are asking for the GREATEST POSSIBLE NUMBER that Jodi can cut out, which means that they are looking for a whole number; how much possible?
6 0
3 years ago
How much feet are in 760yards
Triss [41]

2280 Ft there are 3 feet in a yard

8 0
3 years ago
Read 2 more answers
Which is the smaller integer : -29 or -10 ?
Helga [31]

Answer:

-29

Step-by-step explanation:

On a number line, negative numbers lie on the left side of zero and positives on the right. The furthest to the right of the number line will be the large number and the furthest to the left will be the smaller. -10 is furthest to the right making it the larger integer and -29 the smallest.

8 0
2 years ago
Plz help I will give brainliest
arsen [322]

Answer:

#8. M = -8/9

#9. M = 3/5

6 0
2 years ago
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