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denpristay [2]
3 years ago
6

Please help me with questions 8-13 I need help this is for a grade

Mathematics
1 answer:
sergiy2304 [10]3 years ago
6 0
For triangles, area is 1/2 base times height
8. Base 15 1/4 and height 18. Base and height can be flipped around to make the math easier, so 1/2(18)(15 1/4) = 9(15 1/4) = 9(61/4) = 549/4= 137 1/4 sq inches

9. Base 13 and height 11. Area = (1/2)(13)(11)= (13/2)(11) = 143/2 = 71 1/2 sq inches

10. Same thing again. Base = 30, height = 20, so area = (1/2)(30)(20) = 15(20) = 300 square km.

11. Base = 8, height = 5, so (1/2)(8)(5)= 4(5)= 20 square feet.

12. Base = 5, height = 3, so area = (1/2)(5)(3)= (5/2)(3)= 15/2; for 200 tiles we would take (15/2)(200)= 15(100) = 1500 square cm

13. Monica forgot to multiply base and height by 1/2.
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Gemma had 25.75 grams of frosting

Used 15.5 grams

<u>Left over:</u>

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3 years ago
1.2cm represents 24 km. it is approximately 5 cm from knight rock to storm bay on the map. what is the actual distance in kilome
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Two less than the product of a number and -5 is -42.
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8

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One kilometer equals 0.62 miles. How many kilometers equal 16 miles? Round the answer to the nearest tenth.
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7 0
2 years ago
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The average height of students at UH from an SRS of 12 students gave a standard deviation of 2.5 feet. Construct a 95% confidenc
Vanyuwa [196]

Answer:

c. [1.771;4.245] feet

Step-by-step explanation:

Hello!

The variable of interest is

X: height of a student at UH

X~N(μ;σ²)

You have to estimate the population standard deviation using a 95% confidence interval.

The statistic to use for the interval is a student Chi-Square with n-1 degrees of freedom. First you have to calculate the CI for the population variance:

[\frac{(n-1)S^2}{X^2_{n-1;1-\alpha /2}} ;\frac{(n-1)S^2}{X^2_{n-1;\alpha /2}} ]

X^2_{n-1;1-\alpha /2}= X^2_{11;0.975}= 21.920

X^2_{n-1;\alpha /2}= X^2_{11;0.025}= 3.816

n=12

S= 2.5

[\frac{11*6.25}{21.920} ;\frac{11*6.25}{3.816}} ]

[3.136; 18.016] feet²

Then you calculate the square root of both limits to get the CI for the population standard deviation:

[√3.136; √18.016]

[1.771;4.245] feet

I hope this helps!

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3 years ago
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