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VARVARA [1.3K]
3 years ago
15

13. How many solutions does this equation have: 8d-10=4(2d-6)?

Mathematics
1 answer:
kvasek [131]3 years ago
6 0
13. 8d - 10 = 4(2d - 6) 
      8d - 10 = 8d - 12
      8d - 8d = -12 + 10
       0 = -2......incorrect....NO SOLUTIONS

14. 3.50c > = 500
      c > = 500/3.50
      c > = 142.857....she can sell (minimum) of 143

15. 14c - 10 = 20
      14c = 20 + 10
      14c = 30
         c = 30/14 reduces to 15/7 (or 2 1/7)

16. c = 1.50g + 3
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We are given that a manufacturer produces light bulbs that have a mean life of at least 500 hours when the production process is working properly. The population standard deviation is 50 hours and the light bulb life is normally distributed.

You select a sample of 100 light bulbs and find mean bulb life is 490 hours.

Let \mu = <u><em>population mean light bulb life.</em></u>

So, Null Hypothesis, H_0 : \mu \geq 500 hours      {means that the population mean light bulb life is at least 500 hours}

Alternate Hypothesis, H_A : \mu < 500 hours     {means that the population mean light bulb life is below 500 hours}

The test statistics that would be used here <u>One-sample z test statistics</u> as we know about the population standard deviation;

                           T.S. =  \frac{\bar X-\mu}{\frac{\sigma}{\sqrt{n} } }  ~ N(0,1)

where, \bar X = sample mean bulb life = 490 hours

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So, <u><em>the test statistics</em></u>  =  \frac{490-500}{\frac{50}{\sqrt{100} } }

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Since our test statistic is higher than the critical value of z as -2 > -2.33, so we have insufficient evidence to reject our null hypothesis as it will not fall in the rejection region due to which <u>we fail to reject our null hypothesis.</u>

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lim θ → 0 =  ¹/₂π(tan (0/2))

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