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2 years ago

I really need help plzzzzz

Mathematics

1 answer:

Marianna [84]2 years ago

6 0

Answer:

All similar, see below

Step-by-step explanation:

Angles

26° & 64° & 90°
AA similarity

Ratios of corresponding sides:

6/8 = 9/12 = 12/16 ⇒ 3/4
SSS similarity

Angle C is vertical

∠ACB ≅ ∠DCE

Ratios of corresponding sides:

9/15 = 18/30 ⇒ 3/5
SAS similarity

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Andrew believes the honor roll students at his school have an unfair advantage in being assigned to the math class they request.

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Honor roll Not on honor roll Total
Received math class requested 315 64 379
Did not get math class requested 41 80 121
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3 years ago

9.4 The heights of a random sample of 50 college stu- dents showed a mean of 174.5 centimeters and a stan- dard deviation of 6.9

gladu [14]

Answer: a) (176.76,172.24), b) 0.976.

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Since we have given that

Mean height = 174.5 cm

Standard deviation = 6.9 cm

n = 50

we need to find the 98% confidence interval.

So, z = 2.326

(a) Construct a 98% confidence interval for the mean height of all college students.

$x\pm z\times \dfrac{\sigma}{\sqrt{n}}\\\\=(174.5\pm 2.326\times \dfrac{6.9}{\sqrt{50}})\\\\=(174.5+2.26,174.5-2.26)\\\\=(176.76,172.24)$

(b) What can we assert with 98% confidence about the possible size of our error if we estimate the mean height of all college students to be 174.5 centime- ters?

Error would be

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Hence, a) (176.76,172.24), b) 0.976.

8 0

3 years ago

I really need help plzzzzz​

I really need help plzzzzz