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skelet666 [1.2K]

3 years ago

14

Please help! I'll also give you a brainlist.

1 answer:

nekit [7.7K]3 years ago

6 0

Range: (-infinity, 4]
the ] signifies that the four is included in the range, rather than ) which means reaching but never approaching. this is why we use ( ) for - and + infinity, cause it can never be reached.

minimum: (-infinity, infinity)
keep it in same format as you have for the maximum

increasing
the interval -infinity

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scoundrel [369]

Answer:

54

Step-by-step explanation:

54

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3 years ago

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dem82 [27]

Tha last one PR=XY is not true.

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3 years ago

A trucking firm suspects that the mean lifetime of a certain tire it uses is more than 30,000 miles. To check the claim, the fir

grandymaker [24]

Answer:

We conclude that the lifetime of tires is less than 30,000 miles.

Step-by-step explanation:

We are given the following in the question:

Population mean, μ = 30,000 miles

Sample mean, $\bar{x}$ = 29,400 miles

Sample size, n = 54

Alpha, α = 0.05

Population standard deviation, σ =1200 miles

First, we design the null and the alternate hypothesis

$H_{0}: \mu = 30000\text{ miles}\\H_A: \mu < 30000\text{ miles}$

We use One-tailed z test to perform this hypothesis.

Formula:

$z_{stat} = \displaystyle\frac{\bar{x} - \mu}{\frac{\sigma}{\sqrt{n}} }$

Putting all the values, we have

$z_{stat} = \displaystyle\frac{29400 - 30000}{\frac{1200}{\sqrt{54}} } = -3.6742$

Now, $z_{critical} \text{ at 0.05 level of significance } = -1.64$

Since,

$z_{stat} < z_{critical}$

We reject the null hypothesis and accept the alternate hypothesis.

Thus, we conclude that the lifetime of tires is less than 30,000 miles.

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3 years ago

BRAINLIEST AND 5 STARS TO CORRECT ANSWERS ONLY! PTS TO WHO PARTICIPATES!

irga5000 [103]

Answer:

b). (0, 4)

if you need an explanation, comment, and I will put one in for you :)

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2 years ago

Sixty students got off a school bus. 30% of them were wearing college

Lady_Fox [76]

Answer:

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Step-by-step explanation:

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3 years ago