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alina1380 [7]
3 years ago
15

In Mrs. Ramon's class, the ratio of boys to girls is 2 to 3. The class has 30

Mathematics
1 answer:
Morgarella [4.7K]3 years ago
8 0

Answer:

10 girls

Step-by-step explanation:

Because 2/3 of 30 is 20 making the other 10 girls

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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
Sonbull [250]

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.

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

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

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And the statistic would be given by:

z = \frac{\bar X -\mu}{\frac{\sigma}{\sqrt{n}}}

8 0
3 years ago
A taxi service charges an initial fee plus $1.80 per mile. How far can you travel for 14$
BigorU [14]

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but it depends on what the initail fee is

3 0
3 years ago
7x10^7 in standard form
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4 0
3 years ago
6.875 rounded to the nearest gram
zhenek [66]

Answer: 6.9

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A telephone pole is 24 feet tall. A support cable is attached to the top of the pole to keep the pole from leaning. The stake fo
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Step-by-step explanation:

7 0
3 years ago
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