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a_sh-v [17]
4 years ago
13

How much string is out if a kite is 100 feet above the ground and the string makes an angle of 65° with the ground? Draw a diagr

am and find the length of the string. 46.6 ft. 90.6 ft. 110.3 ft.

Mathematics
2 answers:
aleksklad [387]4 years ago
6 0

Answer:

I believe its is 90.6 for plato if i remember correctly

Step-by-step explanation:

MAVERICK [17]4 years ago
6 0

Answer:

The length of the string is 110.3 ft. Option 3 is correct.

Step-by-step explanation:

Let the length of string be x.

It is given that the kite is 100 feet above the ground and the string makes an angle of 65° with the ground.

In a right angle triangle,

\sin \theta=\frac{perpendicular}{hypotenuse}

\sin (65^{\circ})=\frac{100}{x}

x=\frac{100}{\sin (65^{\circ})}

x=110.3378\approx 110.3

Therefore the length of the string is 110.3 ft. Option 3 is correct.

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This question is incomplete, the complete question;

The American Psychological Associated conducted a survey in 2003 of psychologists to estimate the average incomes for psychologists based on their academic degree and years of experience. 36 psychologists responded who had a just received their masters degree in 2003. The average was $48,800 with a standard deviation of $16,800.

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Answer:

at 95%, confidence interval is ( $43312, $54288 )

Step-by-step explanation:

Given the data in the question;

sample size n = 36

mean x' = 48,800

standard deviation σ = 16,800

at 95% confidence level;

∝ = 1 - 95% = 1 - 0.95 = 0.05

∝/2 = 0.05 / 2 = 0.025

z critical value, Z_{\alpha/2 = 1.96

now, confidence interval for population mean is given by the formula

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so we substitute

⇒ 48800 ±  1.96( 16800/√36 )

⇒ 48800 ±  1.96( 2800 )

⇒ 48800 ±  5488

⇒ 48800 -  5488, 48800 +  5488

⇒ ( 43312, 54288 )

Therefore, at 95%, confidence interval is ( $43312, $54288 )

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