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nevsk [136]
3 years ago
9

HELP

Mathematics
2 answers:
Gemiola [76]3 years ago
6 0

x=3

z=-4

n=11/5

r=26/3

t=-4

hope this helps

ziro4ka [17]3 years ago
4 0

Answer:

Z = -4

Step-by-step explanation:

Simplifying

53 = -19z + 5 + 7z

Reorder the terms:

53 = 5 + -19z + 7z

Combine like terms:

-19z + 7z = -12z

53 = 5 + -12z  

Solving

53 = 5 + -12z

Move all terms containing z to the left, all other terms to the right.

Add '12z' to each side of the equation.

53 + 12z = 5 + -12z + 12z

Combine like terms:

-12z + 12z = 0

53 + 12z = 5 + 0

53 + 12z = 5

Add '-53' to each side of the equation.

53 + -53 + 12z = 5 + -53

Combine like terms: 53 + -53 = 0

0 + 12z = 5 + -53

12z = 5 + -53

Combine like terms: 5 + -53 = -48

12z = -48

Divide each side by '12'.

z = -4

Simplifying

z = -4

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The mean time in hours per day for newborn babies is 16.5 hours ⇒ D

Step-by-step explanation:

A sleep time of 15.9 hours per day for a newborn baby is at the 10th

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Assuming the distribution is normal with a standard deviation of

0.5 hour

To find the mean time let us do that

1. Use the normal distribution table to find the corresponding z-score

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2. Use the rule μ = x - zσ, where μ is the mean, σ is the standard

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3. Substitute the values of x, σ and z in the rule to find μ

Look to the normal distribution table to find z-score that equivalent

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∵ z-score = -1.28

∵ σ = 0.5 hour

∵ x = 15.9

∵ μ = x - zσ

- Substitute the values in the rule

∴ μ = 15.9 - (-1.28)(0.5)

∴ μ = 15.9 + 0.64

∴ μ = 16.54 ≅ 16.5 hours

The mean time in hours per day for newborn babies is 16.5 hours

Learn more:

You can learn more about the normal distribution curve in brainly.com/question/8799684

#LearnwithBrainly

6 0
2 years ago
Please help it will be every helpful
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I don't know what to do but I think it is #1

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Answer:

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