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Jobisdone [24]
2 years ago
6

Your cell phone plan costs $24.99 per month plus $0.13 for each text message you send or receive. You have at most $28 to spend

on your cell phone bal. What is the maximum number of text messages that you can send or receive next month?
Mathematics
1 answer:
oksian1 [2.3K]2 years ago
4 0
You can send only 23 texts, when you are only able to spend $28.
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A design engineer wants to construct a sample mean chart for controlling the service life of a halogen headlamp his company prod
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C) 515 hours.

D) 500 hours

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Step-by-step explanation:

1. Sample 2 mean = x2`= ∑x2/n2= 2060/4= 515 hours

Sample Service Life (hours)

1                2              3

495      525            470

500         515           480

505        505            460

<u>500         515             470        </u>

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2. The mean of the sampling distribution of sample means for whenever service life is in control is 500 hours . It is the given mean in the question and the limits are determined by using  μ ± σ , μ±2 σ  or μ ± 3 σ.

In this question the limits are determined by using  μ ± σ .

3. Upper control limit = UCL = 520 hours

Lower Control Limit= LCL = 480 Hours

Sample 1 mean = x1`= ∑x1/n1= 2000/4= 500 hours

Sample 2 mean = x2`= ∑x2/n2= 2060/4= 515 hours

Sample 3 mean = x3`= ∑x3/n3= 1880/4=  470 hours

This means that the sample mean must lie within the range 480-520 hours but sample 3 has a mean of 470 which is out of the given limit.

We see that the sample 3 mean is lower than the LCL. The other  two means are within the given UCL and LCL.

This can be shown by the diagram.

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