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katen-ka-za [31]
2 years ago
5

Help! Help! Help! Help!

Mathematics
1 answer:
alexgriva [62]2 years ago
6 0
A. C(n)=10n+125

cost×number of buttons is equal to 10 cents times the number of buttons, plus the $125 cost of the button machine
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C=1/4 (d+3) make d the subject​
trasher [3.6K]

Answer:

4c-3=d

Step-by-step explanation:

4c=d+3

4c-3=d

4 0
2 years ago
The average survival time after diagnosis for a certain type of cancer on the standard treatment is two years. A medical researc
wolverine [178]

Answer:

The sample size is too small

Step-by-step explanation:

The answer is the last one: the sample size is too small. Since we only got 3 subjects to test, maybe one of them could live for a long time after the diagnosis of Cacer and that made the average survival time go up by a lot.

In order to obtain results with a significance level higher, you need a sample size of at least 20 subjects.

Now lets see why other options wouldnt be good answers:

  • For a small amount of subjects, it is unlikely to have errors in caculation
  • The sample size is given
  • We are not given information about the treatment and we dont even know if the subjects feel more confident with the new treatment. Also, if a Placebo effect works regularly, it shouldnt limit statistical sifgnificance
  • An increase in 2 years is huge in comparison with the previous survival time.

4 0
3 years ago
. Among all the income tax forms filed in a certain year, the mean tax paid was $2000, and the standard deviation was $500. In a
Anarel [89]

Answer:

a) 0.8413

b) 0.6293

Step-by-step explanation:

Data provided:

Mean tax paid = $2000

Standard deviation = $500

Sample size, n = 625

n=625

Now,

a) P( average tax paid on the sample forms is greater than $1980)

⇒ P(X > 1980)

or

⇒ P(\frac{(X-mean)}{\frac{s}{\sqrt n}})

or

⇒ P(\frac{(1980-2000)}{\frac{500}{\sqrt{625}}})

or

⇒ P(Z > -1)

or

= 0.8413 (From standard normal table)

b) P(more than 60 of the sampled forms have a tax of greater than $3000)

given:  p = 10% = 0.1

Now, by using CLT

mean = n × p

= 625 × 0.1

= 62.5

Standard deviation, s =\sqrt{n\times p\times(1-p)}

=\sqrt{625\times0.1\times(1-0.1)}

= 7.5

Thus,

P(X > 60)

= P(\frac{(X-mean)}{s} > \frac{(60-62.5)}{7.5})

or

= P(Z > -0.33)

= 0.6293     (From standard normal table)

4 0
3 years ago
If a person's eye level is
dem82 [27]
Reallyhow is this elementry
5 0
3 years ago
Read 2 more answers
Maggie uses 6.9 pints of white paint and blue paint to paint her bedroom walls. 3 5 of this amount is white paint, and the rest
LekaFEV [45]

Answer:

2.76 pints

Step-by-step explanation:

Given that:

Tottal amount of paint used = 6.9 pints

The faction of white paint used = 3/5

Hence, Amount of white Paint used :

3/5 * 6.9 = (3 * 6.9) / 5 = 4.14 pints of white paint.

Pints of blue paints used :

Total pints - pints of white used

6.9 - 4.14 = 2.76 pints of blue paint

8 0
2 years ago
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