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4 years ago

Please help me with the bonus (10 points)

Mathematics

2 answers:

dalvyx [7]4 years ago

6 0

A) Is 2

B) Is 2.5

Hope this helps. :)

Klio2033 [76]4 years ago

4 0

I know A is 400 but idk about B

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3 years ago

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B.

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3 years ago

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Alex

Answer:

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Step-by-step explanation:

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3 0

3 years ago

Read 2 more answers

A mechanic sells a brand of automobile tire that has a life expectancy that is normally distributed, with a mean life of 27 com

Harrizon [31]

Answer:

Tires that wear out by approximately 24307.8 miles will be replaces free of charge.

Step-by-step explanation:

We are given the following information in the question:

Mean, μ = 27,000 miles

Standard Deviation, σ = 2100 miles

We are given that the distribution of life expectancy is a bell shaped distribution that is a normal distribution.

Formula:

$z_{score} = \displaystyle\frac{x-\mu}{\sigma}$

We have to find the value of x such that the probability is 0.10

$P( X < x) = P( z < \displaystyle\frac{x - 27000}{2100})=0.10$

Calculation the value from standard normal z table, we have,

$\displaystyle\frac{x - 27000}{2100} = -1.282\\\\x = 24307.8$

Tires that wear out by approximately 24307.8 miles will be replaces free of charge.

4 0

4 years ago