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balu736 [363]
3 years ago
10

What is the price if it’s 20% off $30

Mathematics
2 answers:
Xelga [282]3 years ago
5 0

Answer: $24

Step-by-step explanation:

inessss [21]3 years ago
5 0

Answer:

$24

Step-by-step explanation:

given :

discount = 20% off $30

= (20/100) x $30

= $6

selling price = original price - discount

= $30 - $6 = $24

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Is the mean age at which American children learn to walk less than 15 months? A study of 40 American children found a mean walki
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Answer:

We define the random variable X as the walking age and we are interested if American children learn to walk less than 15 months so then that would be the alternative hypothesis and the complement would be the null hypothesis.

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And for this case the best answer would be:

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Step-by-step explanation:

We define the random variable X as the walking age and we are interested if American children learn to walk less than 15 months so then that would be the alternative hypothesis and the complement would be the null hypothesis.

Null hypothesis: \mu \geq 15

Alternative hypothesis: \mu

And for this case the best answer would be:

H 0 : μ ≥ 15 vs. Ha : μ < 15

And the data given from the sample is:

\bar X = 13.2 represent the sample mean

\sigma represent the population deviation

n = 40 represent the sample size

And the statistic would be given by:

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Step-by-step explanation:

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