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2 years ago

What is the value of 2 + b(a? + 4) when a = 2 and b = 4? A 22 B 34 C 2 D 48

Mathematics

1 answer:

lisov135 [29]2 years ago

4 0

Answer: 26

Step-by-step explanation:

lets replace a and b with the numbers provided

2+4(2+4)=2+4(6)=2+24=26

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Answer:

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Step-by-step explanation:

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2 years ago

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What is the smallest fractional portion of an inch that you can measure with the ruler shown in Exam Figure A1?

oksano4ka [1.4K]

Answer:

The minimun portion of inches that can be measured with the ruler is 1/16''.

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3 years ago

A study of women’s weights found that a randomly selected sample of 234 women had a mean weight of 157.3 lb. Assuming that the p

Scilla [17]

Answer:

$157.3-1.96\frac{15.6}{\sqrt{234}}=155.301$

$157.3+1.96\frac{15.6}{\sqrt{234}}=159.299$

So on this case the 95% confidence interval would be given by (155.301;159.299)

And the best option would be:

B. (155.3, 159,3)

Step-by-step explanation:

Information given

$\bar X=157.3$ represent the sample mean

$\mu$ population mean (variable of interest)

$\sigma =15.6$ represent the population standard deviation

n=234 represent the sample size

Confidence interval

The confidence interval for the mean is given by the following formula:

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

The Confidence level is is 0.95 or 95%, the significance is $\alpha=0.05$ and $\alpha/2 =0.025$ , the critical value for this case would be $z_{\alpha/2}=1.96$