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Dmitriy789 [7]
4 years ago
6

Please help !!!!! picture shown

Mathematics
1 answer:
maks197457 [2]4 years ago
4 0
I'm sure the answer is B.

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How much does a sleeping bag cost? Let's say you want a sleeping bag that should keep you warm in temperatures from 20°F to 45°F
Ira Lisetskai [31]

Answer:

a) x = 80.40

s = 29.54

b) lower limit = 69.53

upper limit = 91.27

Step-by-step explanation:

The mean price is:

\bar X=\frac{1}{n}\sum x_i=\frac{1}{20}(50+80+...+70)=\frac{1608}{20} =80.40

The standard deviation is

s=\sqrt{\frac{1}{n-1}\sum(x_i-\bar X)^2}=\sqrt{\frac{1}{19}[(50-80.4)^2+...+(70-80.4)^2]} \\\\s=\sqrt{\frac{15,471}{19} }=\sqrt{814.25} =29.54

We have to calculate a 90% CI for the mean.

The z-value for a 90% confidence interval is z=1.645.

The margin of error is:

E=z\cdot \sigma / \sqrt{n}=1.645*29.54/\sqrt{20}=48.59/4.47=10.87

The 90% CI is

\bar X-z\sigma/\sqrt{n} \leq \mu \leq \bar X-z\sigma/\sqrt{n}\\\\80.40-10.87 \leq \mu \leq 80.40+10.87\\\\69.53\leq \mu \leq 91.27

4 0
4 years ago
Wat is 2+1? Plese I ned aner four homwok
weeeeeb [17]

Answer:

3

Step-by-step explanation:

6 0
3 years ago
Read 2 more answers
An isosceles triangle has two angles both equal to x°. The third angle is 60° bigger than either of these. Find the value of x°.
Elina [12.6K]
X+x+(x+60)=180
3x+60=180
3x=120
x=40
5 0
4 years ago
What is 6x^3+4x^2+2x divided by 2x
Alex Ar [27]

Answer:

3x^2 + 2x

Step-by-step explanation:

8 0
3 years ago
How do you do this question
maxonik [38]

Answer:

I am not sure about the actual answer but hopefuly you figure this out

Step-by-step explanation:

To get the number of boys and girls you do 3+5 to get 8. 120 divided by 8 is 15. so every digit in the ratio is 15 students. 15x3 is 45 and 15x5 is 75. there are 45 girls and 75 boys. 16/25 of the boys go climbing. There are 75 boys so you do 16x3 because 25x3 is 75 so 16x3 is 48. 48 boys go climbing. 120-48 is 72. and 27 boys go sailing.

8 0
3 years ago
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