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ipn [44]
3 years ago
6

triangle jkl is similar to triangle tuv. find the missing side length of triangle tuv. JK=10in JL=8in KL=13in TU=7.5 UV=9.75 fin

d TV
Mathematics
1 answer:
hammer [34]3 years ago
7 0

Answer:

TV=6 inch

Step-by-step explanation:

If Triangle JKL is similar to Triangle TUV, the following ratio applies.

\dfrac{JK}{TU}= \dfrac{KL}{UV}=\dfrac{JL}{TV}\\$JK=10in.,  JL=8in.,  KL=13in.,  TU=7.5.,  UV=9.75\\\dfrac{10}{7.5}= \dfrac{13}{9.75}=\dfrac{8}{TV}\\$Picking any two equal ratios\\ \dfrac{13}{9.75}=\dfrac{8}{TV}\\$Cross multiply\\13*TV=8*9.75\\TV=8*9.75 \div 13\\$TV=6 inch

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The electric cooperative needs to know the mean household usage of electricity by its non-commercial customers in kWh per day. A
vekshin1

Answer:

15.7-2.58\frac{2.3}{\sqrt{1731}}=15.6    

15.7+2.58\frac{2.3}{\sqrt{1731}}=15.8    

We are 99% confident that the true mean of electricity comsumption is between (15.6 and 15.8) kWh

Step-by-step explanation:

Information provided

\bar X= 15.7 represent the sample mean for the usage of electricity

\mu population mean (variable of interest)

\sigma= 2.3 represent the population standard deviation

n=1731 represent the sample size  

Confidence interval

The confidence interval for the mean is given by the following formula if we know the population deviation:

\bar X \pm z_{\alpha/2}\frac{\sigma}{\sqrt{n}}   (1)

The Confidence level provided is  0.99 or 95%, the value of significance is \alpha=0.01 and \alpha/2 =0.005, and we can use excel, a calculator or a table to find the critical value. The excel command would be: "=-NORM.INV(0.005,0,1)".And we see that z_{\alpha/2}=2.58

And replacing we got:

15.7-2.58\frac{2.3}{\sqrt{1731}}=15.6    

15.7+2.58\frac{2.3}{\sqrt{1731}}=15.8    

We are 99% confident that the true mean of electricity comsumption is between (15.6 and 15.8) kWh

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4 years ago
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