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Lyrx [107]
3 years ago
8

What is 5/6mn-7/8mn? Explain how you got it

Mathematics
1 answer:
Misha Larkins [42]3 years ago
8 0
-1/24 is that true?????????
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A shopkeeper marks his goods at 40% above cost (the price he pays for the goods) and then offers a 25% discount.if a jacket cost
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Answer:

A shopkeeper marks:

$200 * 1.4 = $280

Step-by-step explanation:

With a discount of 25%:

$280 * 0.75 = $210

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Katherine Johnson is best known for her work on ________.
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Pretty sure she was best known for calculating flight paths of spacecraft.

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Whats the sign of 23/45+(-23/45)
Ierofanga [76]

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it’s +

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Step-by-step explanation:

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3 years ago
The average hourly wage for a high school student in Illinois is $8.25 per hour with a standard deviation of $.25. Assume hourly
serious [3.7K]

Answer:

Step-by-step explanation:

Hello!

The variable of interest is

X: hourly wage of a high school student

X~N(μ;σ²)

X[bar]= $8.25

σ= $0.25

For a 95% CI for the average hourly wage for<u> 1 </u>high school student:

For this exercise you have to consider the sample size n=1

a) The margin of error of the CI is calculated as:

d= Z_{1-\alpha /2} * σ

1-α: 0.95 ⇒ α:0.05

1-α/2:0.975

Z_{1-\alpha /2}= Z_{0.975}= 1.96

d= 1.96 * 0.25= 0.49

b)

The formula for the interval is

X[bar] ± Z_{1-\alpha /2} * σ

[8.25 ± 0.49]

[7.76; 8.74]

With a 95% you'd expect the interval $[7.76; 8.74] to include the average hourly wage of one high school student in Illinois.

c)

Te calculated interval is $ [7.76; 8.74] the value $9.15 does nor fall within that acceptable range.

I hope this helps!

7 0
3 years ago
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