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Masteriza [31]
3 years ago
14

Can someone tell me the answer step by step about the surface area please I really need help

Mathematics
1 answer:
solmaris [256]3 years ago
5 0
What you have to do is find the sume of all of the areas of the rectangles in this rectangular prism.

Lets find the front and back first.

9in * 14in = 126 in^2
9in * 14in = 126 in^2
                =  252 in^2

Now for the top and bottom.

3in * 14in = 42 in^2
3in * 14in = 42 in^2
                = 84 in^2

And now for the left and right
9in * 3in = 27 in^2
9in * 3in = 27 in^2
              = 54 in^2

Finally we can add them all together!
252 in^2 + 84 in^2 + 54 in^2= 390 in squared.
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For a medical study, a researcher wishes to select people in the middle 60% of the population based on blood pressure.
Finger [1]

Answer:

Lower limit: 113.28

Upper limit: 126.72

Step-by-step explanation:

Problems of normally distributed samples are solved using the z-score formula.

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 problem, we have that:

\mu = 120, \sigma = 8

Middle 60%

So it goes from X when Z has a pvalue of 0.5 - 0.6/2 = 0.2 to X when Z has a pvalue of 0.5 + 0.6/2 = 0.8

Lower limit

X when Z has a pvalue of 0.20. So X when Z = -0.84

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

-0.84 = \frac{X - 120}{8}

X - 120 = -0.84*8

X = 113.28

Upper limit

X when Z has a pvalue of 0.80. So X when Z = 0.84

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

0.84 = \frac{X - 120}{8}

X - 120 = 0.84*8

X = 126.72

4 0
3 years ago
The answer options are
babymother [125]

Ansgilcx dhsvguydfsjhujvcouwaihgraeuvyjsghdnvufyiekghabsuivkjkesd

Step-by-step explanation:

3 0
3 years ago
David is pouring an entire gallon of milk into 12 glasses. What part of a gallon will be in each glass
expeople1 [14]
This question calls for a fraction.  In a fraction, the numerator (top number) is the number of parts, while the denominator (bottom number) is the total number of parts.  One part is one glass of milk, and there are 12 parts total.  So, we get the answer 1/12.

Answer: 1/12
7 0
3 years ago
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Staples sells 5 packs of paper for $7.80. How much would 3 packs cost? help
taurus [48]
Divide $7.80 by 3
gives you $2.6
3 0
3 years ago
Find the product. tell which strategy you used. show work
tino4ka555 [31]
8•25•23=
25 eight times is 25 four times + 25 four more times
((25•4)+(25•4))•23= (100+100)•23= 200•23= 2•23•100= 46•100= 4,600
7 0
3 years ago
Read 2 more answers
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