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4 years ago

If angle of a sector is 115 what is the central angle

1 answer:

3 0

If angle of a sector is 115
the central angle would be 115 also

as the arc measure is equal to the measure of its central angle

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A chemist examines 15 geological samples for potassium chloride concentration. The mean potassium chloride concentration for the

Lelu [443]

Answer:

95% Confidence interval: (0.375,0.377)

Step-by-step explanation:

We are given the following in the question:

Sample mean, $\bar{x}$ = 0.376 cc/cubic meter

Sample size, n = 15

Alpha, α = 0.05

Sample standard deviation, s = 0.0012

Degree of freedom =

$=n-1\\=15-1\\=14$

95% Confidence interval:

$\bar{x} \pm t_{critical}\displaystyle\frac{s}{\sqrt{n}}$

Putting the values, we get,

$t_{critical}\text{ at degree of freedom 14 and}~\alpha_{0.05} = \pm 2.145$

$0.376 \pm 2.145(\dfrac{0.0012}{\sqrt{15}} )\\\\ = 0.376 \pm 0.0006\\\\ = (0.3754,0.3766)\approx (0.375,0.377)$

(0.375,0.377) is the required 95% confidence interval for the population mean potassium chloride concentration.

5 0

3 years ago

I need help need help with Geometry

Karo-lina-s [1.5K]

Answer:

Step-by-step explanation:

X is 21

z is the same as 111

y is 48

4 0

3 years ago

Simplfy (x)^2(2xy^3)^5 plz help

Deffense [45]

Answer: 32x^7y^15

Step-by-step explanation:

(x)^2(2xy^3)^5

= x^2 * 32x^5y^15

= 32x^7y^15

5 0

3 years ago

What is the GCF of 24 and 40

nikitadnepr [17]

Answer:

Step-by-step explanation:

24 = 2* 2 * 2 * 3

40 = 2 * 2 * 2 * 5

GCF = 2*2*2 = 8

6 0

3 years ago

Which number line model represents the expression -2 + 4.5 ?

Lana71 [14]

Answer:

the second pic. A

Step-by-step explanation:

4 0

3 years ago