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Arisa [49]
3 years ago
12

I need to know if it is right if not help me please!

Mathematics
2 answers:
Aloiza [94]3 years ago
6 0
Yes the answer it's right you can use it.
padilas [110]3 years ago
4 0

Answer I'm pretty sure that this is right.


Step-by-step explanation:I checked over a lot of your work and it seems as if you got everything right. PLEASE MARK THIS BRAINLIEST. PLEASE


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Customers arrive at a movie theater at the advertised movie time only to find that they have to sit through several previews and
sergij07 [2.7K]

Answer:

a) sample size is 40

Step-by-step explanation:

(a)

\sigma=4 minutes

Margin of error, E is 75 seconds E=75/60= 1.25 minutes.

The level of significance \alpha= 0.05 for 95% level of significance

For 95% confidence interval z_{\frac{\alpha}{2}}=1.96 from standard deviation table

Sample size required, n

n=\left (\frac{z_{\frac{\alpha}{2}}\cdot \sigma}{E} \right )^{2}=\left (\frac{1.96\cdot4}{75/60} \right )^{2}=39.337984

Rounding off, n=40

Sample size =40

Keywords:

95% confidence, sample size, Wall Street Journal

3 0
3 years ago
1. The table shows the relationship between y, the cost to rent a bicycle, and x, the amount of time the bicycle is rented in ho
Arlecino [84]

Answer:

I am not really sure what the question is But it is a slope

Step-by-step explanation:

5 0
3 years ago
19. When baking a cake, you have a choice of the following pans:
dimaraw [331]

The answer is

round cake - 82.42 in²

rectangular cake - 114 in²

Round cake:

d = 7 in

r = d/2 = 7 in / 2 = 3.5 in

h = 2 in

The surface are of a cylinder is:

A = 2πr² + 2πrh

The surface are of the round cake (which is actually a cylindrical cake) excluding the bottom is:

A = 2πr² + 2πrh - πr²

A = πr² + 2πrh

A = 3.14 * 3.5² + 2 * 3.14 * 3.5 * 2

= 38.46 + 43.96

= 82.42 in²

Rectangular cake:

w = 6 in

l = 9 in

h = 2 in

The surface are of a rectangle is:

A = 2wl + 2wh + 2lh

The surface are of the rectangular cake excluding the bottom is:

A = 2wl + 2wh + 2lh - wl

A = wl + 2wh + 2lh

A = 6 * 9 + 2 * 6 * 2 + 2 * 9 * 2

= 54 + 24 + 36

= 114 in²

Step-by-step explanation: This answer is not mine but JcAlmighty’s so all credits go to them.

7 0
2 years ago
Read 2 more answers
What is the surface area of the rectangular prism?
azamat

Answer:

its 288 if u search formula for surface area of a rectangular prism

Step-by-step explanation:

4 0
3 years ago
PLEASE ANSWER!!!
Vesnalui [34]

Answer:

i dont really know im sorry

Step-by-step explanation:

ya sorry again

4 0
3 years ago
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