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hodyreva [135]
3 years ago
6

PLZ HELPPP What number is 70% of 60?

Mathematics
2 answers:
kvasek [131]3 years ago
5 0

Answer:

42

Step-by-step explanation:

34kurt3 years ago
3 0

Answer:

42

Step-by-step explanation:

42/60 = 70%

(Hope I helped)

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How many complex roots does the polynomial equation below have?
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Step-by-step explanation:

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Life tests performed on a sample of 13 batteries of a new model indicated: (1) an average life of 75 months, and (2) a standard
Alja [10]

Answer:

The lower limit of the 90% confidence interval for the population mean life of the new model is 72.53 months.

Step-by-step explanation:

Our sample size is 13.

The first step to solve this problem is finding our degrees of freedom, that is, the sample size subtracted by 1. So

df = 13-1 = 12

Then, we need to subtract one by the confidence level \alpha and divide by 2. So:

\frac{1-0.90}{2} = \frac{0.10}{2} = 0.05

Now, we need our answers from both steps above to find a value T in the t-distribution table. So, with 12 and 0.05 in the t-distribution table, we have T = 1.782.

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s = \frac{5}{\sqrt{13}} = 1.3868

Now, we multiply T and s

M = T*s = 1.782*1.3868 = 2.47

The lower end of the interval is the mean subtracted by M. So it is 75 - 2.47 = 72.53

The lower limit of the 90% confidence interval for the population mean life of the new model is 72.53 months.

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