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3 years ago

50 is 40% of what number? And we need to do the proportions/ example 50/100 etc. and please explain.. :)

Mathematics

2 answers:

aleksandr82 [10.1K]3 years ago

7 0

50/X = 40/100

50 × 100 = 40 × X

5000 = 40X

5000/40 = 40X/40

125 = X

Diano4ka-milaya [45]3 years ago

5 0

X= 125

the equation is
is/of %/100

50 = is
40 = %
X = of
100 = 100

50 X 100 = 5,000
40 X x = 40x

40x / 40 = x
5,000 / 40 = 125

SO... x = 125

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2 years ago

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3 years ago

In a random sample of 30 people who rode a roller coaster one day, the mean wait time is 46.7 minutes with a standard deviation

Rainbow [258]

Answer: C. $(29,\ 37.8)$

Step-by-step explanation:

The confidence interval for difference of two population mean is given by :-

$\overline{x}_1-\overline{x}_2\pm z_{\alpha/2}\sqrt{\dfrac{s_1^2}{n_1}+\dfrac{s_2^2}{n_2}}$

Given : Level of significance : $1-\alpha:0.99$

Then , significance level : $\alpha: 1-0.99=0.01$

Critical value : $z_{\alpha/2}=z_{0.005}=2.576$

$n_1=30\ ;\ n_2=50\\\\\overline{x}_1=46.7\ ;\ \overline{x}_2=13.3\\\\s_1=9.2\ ;\ s_2=1.9$

$46.7-13.3\pm(2.576)\sqrt{\dfrac{9.2^2}{30}+\dfrac{1.9^2}{50}}\approx33.4\pm4.38=(29.02\ ,37.78)\approx(29,\ 37.8)$

Hence, a 99% confidence interval for the difference between the mean wait times of everyone who rode both rides $(29,\ 37.8)$

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3 years ago

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3 years ago

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The x intercept is where y = 0
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6 0

3 years ago

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