3 years ago

Simplify the number using the imaginary unit i √-28

Mathematics

2 answers:

frez [133]3 years ago

7 0

Answer:

2i√7

this is the correct answer. just took the quiz

Step-by-step explanation:

gizmo_the_mogwai [7]3 years ago

4 0

Choice 3 for this ☺️

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3 years ago

Write the equation for 5x + 2y = 3 in slope-intercept form.<br> 11

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3 years ago

A recent survey of 50 executives who were laid off during a recent recession revealed it took a mean of 26 weeks for them to fin

g100num [7]

Answer: $(24.28,\ 27.72)$

Step-by-step explanation:

Given : Sample size : $n=50$

Sample mean : $\overline{x}=26$

Standard deviation : $\sigma =6.2$

Significance level : $\alpha=1-0.95=0.05$

Critical value : $z_{\alpha/2}=1.96$

Formula to find the confidence interval for population mean :-

$\overline{x}\pm z_{\alpha/2}\dfrac{\sigma}{\sqrt{n}}\\\\=26\pm(1.96)\dfrac{6.2}{\sqrt{50}}\\\\\approx26\pm1.72\\\\=(26-1.72,\ 26+1.72)\\\\=(24.28,\ 27.72)$

Hence, a 95% confidence interval for the population mean = $(24.28,\ 27.72)$

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3 years ago