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Semenov [28]
3 years ago
7

If the total cost of a $32 item is $33.60, what is the total cost on a $55 item?

Mathematics
1 answer:
liq [111]3 years ago
3 0

Answer:

55.00

Step-by-step explanation:

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Suppose the sample space for a continuous random variable is 0 to 80. If the area under the density curve for the variable from
nikklg [1K]
Hello,

Area under the curve is 1.

So p(x>5)=1-p(x<5)=1-0.0625=0.9375

Answer A

4 0
3 years ago
Solve: (⅓) x – 13 &gt; 14<br> A) x &lt; 81 <br> B) x &gt; 81<br> C) x &gt; 9 <br> D) x &lt; 9
frozen [14]

\dfrac{1}{3}x-13>14\qquad\text{add 13 to both sides}\\\\\dfrac{1}{3}x>27\qquad\text{multiply both sides by 3}\\\\\boxed{x>81}\to\boxed{B)}

4 0
3 years ago
What sum would yield an interest of 36$ in 3 years at 3%p.a.
Alekssandra [29.7K]
Amount of Interest = $36
Rate of interest = 3% per annum
Total time period for which the money was invested = 3 years
Let us assume the Principal amount = x
Then
Interest = Principal * Rate of Interest * time
36 = x * 3% * 3
36 = 9x/100
36 * 100 = 9x
3600 = 9x
x = 3600/9
   = 400
So the initial sum of the money that was invested was $400.
7 0
3 years ago
In a survey, 28 people were asked how much they spent on their child's last birthday gift. The results were roughly bell-shaped
Rina8888 [55]

Answer:

The 80% confidence level estimate for how much a typical parent would spend on their child's birthday gift is between $33.954 and $35.246.

Step-by-step explanation:

We have the standard deviation for the sample, which means that the t-distribution should be used to solve this question.

The first step to solve this problem is finding how many degrees of freedom, we have. This is the sample size subtracted by 1. So

df = 28 - 1 = 27

80% confidence interval

Now, we have to find a value of T, which is found looking at the t table, with 27 degrees of freedom(y-axis) and a confidence level of 1 - \frac{1 - 0.8}{2} = 0.9. So we have T = 1.314

The margin of error is:

M = T\frac{s}{\sqrt{n}} = 1.314\frac{2.6}{\sqrt{28}} = 0.646

In which s is the standard deviation of the sample and n is the size of the sample.

The lower end of the interval is the sample mean subtracted by M. So it is 34.6 - 0.646 = $33.954

The upper end of the interval is the sample mean added to M. So it is 34.6 + 0.646 = $35.246

The 80% confidence level estimate for how much a typical parent would spend on their child's birthday gift is between $33.954 and $35.246.

3 0
3 years ago
Complete this sentence. If volume remains the same while the mass of a substance ________, the density of the substance will____
Mariulka [41]

Answer:

Increases, increase

Step-by-step explanation:

Density is M×V, meaning if one goes up and one stays the same, it goes up.

7 0
3 years ago
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