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3 years ago

13=5+2(x-17) Help me pls

Mathematics

1 answer:

ozzi3 years ago

3 0

<h3>The value of x is equal to 21.</h3>

13 = 5 + 2(x - 17)

Distributive property.

13 = 5 + 2x - 34

Add 34 to both sides.

47 = 5 + 2x

Subtract 5 from both sides.

42 = 2x

Divide both sides by 2.

x = 21

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3 years ago

Cholesterol levels for a group of women aged 30-39 follow an approximately normal distribution with mean 190.14 milligrams per d

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Answer:

Step-by-step explanation:

Hello!

X: Cholesterol level of a woman aged 30-39. (mg/dl)

This variable has an approximately normal distribution with mean μ= 190.14 mg/dl

1. You need to find the corresponding Z-value that corresponds to the top 9.3% of the distribution, i.e. is the value of the standard normal distribution that has above it 0.093 of the distribution and below it is 0.907, symbolically:

P(Z≥z₀)= 0.093

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P(Z≤z₀)= 0.907

Since the Z-table shows accumulative probabilities P(Z<Z₁₋α) I'll work with the second expression:

P(Z≤z₀)= 0.907

Now all you have to do is look for the given probability in the body of the table and reach the margins to obtain the corresponding Z value. The first column gives you the integer and first decimal value and the first row gives you the second decimal value:

z₀= 1.323

Using the Z value from 1., the mean Cholesterol level (μ= 190.14 mg/dl) and the Medical guideline that indicates that 9.3% of the women have levels above 240 mg/dl you can clear the standard deviation of the distribution from the Z-formula:

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Z= (X- μ)/δ

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I hope it helps!

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Step-by-step explanation:

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Distance parcourue pour aller à Pittsburgh: 1269.8 km

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