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Alexxx [7]
2 years ago
8

The lifetimes of a certain type of automobile tire have been found to be distributed normally with a mean lifetime of 130,000 km

and a standard deviation of 1,700 km.
A) Find the Z-Score of a tire that has a lifetime of 126,005 km: Z-
(Round to two decimal places)
B) Find the lifetime of a tire if it has a z score of - 1.96: Lifetime - km
(Round to nearest whole number)
Mathematics
1 answer:
Lesechka [4]2 years ago
6 0

Answer:

b

Step-by-step explanation:

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Bryan decided to ride his bike along a new route home from school to avoid some construction. Before leaving school, he estimate
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<h3>Answer:   20 minutes.</h3>

Work Shown:

Estimate = 1.25*(actual time)

Estimate = 1.25*(16)

Estimate = 20

Bryan estimated it would take 20 minutes.

Note: The multiplier 1.25 represents an increase of 25%

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A leaky pool loses 2 and one-fourth inches of water each day. Jermaine and Mildred are asked to determine the change in the amou
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Answer:

  Mildred is correct because she distributed 5 correctly

Step-by-step explanation:

We cannot tell exactly which solution goes with which student, but we believe you are saying ...

Mildred’s Solution:

  5 (Negative 2 and one-fourth) = 5 (negative 2 minus one-fourth)

  = negative 10 minus StartFraction 5 over 4 EndFraction

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This solution describes the correct distribution of 5. Whoever it belongs to gave the correct solution.

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4 years ago
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Step-by-step explanation:

3 0
3 years ago
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Solve. 90^x = 27. Explain every step.
DaniilM [7]

Answer:

The answer is ⇒ x = 0.73244

Step-by-step explanation:

∵ 90^x = 27 ⇒ insert log in both sides

∴ log(90)^{x}=log(27)

∵ 90 = 9 × 10 , 27 = 3³

∵ log(a)^<em>b</em> = <em>b</em><em> </em>log(a)

∴ log(9 × 10)^x = x log(9 × 10)

∴ xlog(9*10)=log(3^{3})

∵ log(a × b) = log(a) + log(b)⇒log(9 × 10) = log(9) + log(10)

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∴ x[log(3)^{2}+1]=3log(3)

∴ x[2log(3)+1] = 3log(3)

∴ x = (3log3)/[2log(3)+1]

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3 years ago
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