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Vitek1552 [10]
3 years ago
6

PLZ HELP QUICK

Mathematics
1 answer:
Luba_88 [7]3 years ago
8 0
A. False. The domain (x-coordinates) starts at 0, not at 100.

b. True. The range (y-coordinates) does start at 100 and increases.

c. True. The graph moves up to the right showing an increase in y as x increases.

d. True. Point (40, 222.11) means that when x = 40 years, y = $222.11.

e. False. The initial point is at x = 0 when the account was opened. At x = 1, it is already 1 year after the account was opened.
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ACT scores have a mean of 20.8 and 9 percent of the scores are above 28. The scores have a distribution that is approximately no
dimaraw [331]

Answer: 5.37

Step-by-step explanation:

Let x =  ACT scores.

Given: ACT scores have a mean of 20.8 and 9 percent of the scores are above 28. The scores have a distribution that is approximately normal.

i.e. P(X>28)=0.09   (i)

Now,

P(X>28)=P(\dfrac{X-\mu}{\sigma}>\dfrac{28-20.8}{\sigma})\\\\= P(z>\dfrac{7.2}{\sigma})\ \ \ \ [z=\dfrac{X-\mu}{\sigma}]    (ii)

One -tailed z value for p-value of 0.09 =1.3408 [By z-table]

From (i) and (ii)

\dfrac{7.2}{\sigma}=1.3408\\\\\Rightarrow\ \sigma=\dfrac{7.2}{1.3408}\\\\\Rightarrow\ \sigma=5.37

Hence, the standard deviation = 5.37

5 0
3 years ago
Tell whether each pair of angles are elther supplementary or congruent.
sveta [45]
It’s supplementary
t is the answer
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3 years ago
The cost of a CD at Ernesto's Music Emporium is $12, including tax. Brian has a $100 gift card from Ernesto's. What is his balan
Allushta [10]
$52 because 4 times 12 equals 48 so 100 minus 48 equals 52
6 0
3 years ago
Deepak randomly chooses two marbles from the bag,
Alika [10]
Green 5/15
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Renting a tool form Store A costs $9.75 per hour plus a fee of $188.55. Renting the same tool
alexandr402 [8]

Answer:

G 15.99h > 188.55 + 9.75h

Step-by-step explanation:

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