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2 years ago

50% of 42 students are girls. How many of the students are girl's

Mathematics

1 answer:

Anettt [7]2 years ago

3 0

Answer:

21 girls.

Step-by-step explanation:

50% of 42 students are girls.

So 42/2 = 21.

Therefore 21 of the students are girls.

Hope I helped

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A random sample of 64 items is selected from a population of 400 items. The sample mean is 200. The population standard deviatio

Usimov [2.4K]

Answer: $(188.24,\ 211.76 )$ .

Step-by-step explanation:

Given : Sample size : n= 64 , the sample is a large sample (n>30), so we can apply z-test.

Sample mean = $\overline{x}=200$

Standard deviation : $\sigma=48$

Level of confidence: $1-\alpha=0.95$

$\Rightarrow\ \alpha=0.05$

Then, critical z-value = $z_{\alpha/2}=1.96$

The confidence interval to estimate the population mean is given by :_

$\overline{x}\ \pm\ z_{\alpha/2}\dfrac{\sigma}{\sqrt{n}}$

$=200\ \pm\ (1.96)\dfrac{48}{\sqrt{64}}\\\\=200\pm11.76=(200-11.76, 200+11.76)=(188.24,\ 211.76 )$

Hence, the 95% confidence interval to estimate the population mean can be computed as $(188.24,\ 211.76 )$ .

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3 years ago

Help me on this 2 : ?

natka813 [3]

Answer:

2:7

Step-by-step explanation:

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3 years ago

Jackson has a rope 1 foot 8 inches long. He cuts it into 4 equal pieces. How many inches long is each piece?

mote1985 [20]

1 foot 8 inches.

1 foot = 12 inches.

1 foot 8 inches = 1 foot + 8 inches = 12 inches + 8 inches = 20 inches.

He cuts into 4 equal pieces.

= 20 / 4

= 5 inches.

Each piece would be 5 inches long.

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3 years ago

Solve for the value of n.

dusya [7]

Answer:

3n-4= 44

3n=40

no u can solve

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3 years ago

Read 2 more answers

Q = 15 a = 16 What would you do with q and a to get 240?

ch4aika [34]

You multiply Q and a to get 240, because 15 x 16 = 240.

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4 years ago

50% of 42 students are girls. How many of the students are girl's​

50% of 42 students are girls. How many of the students are girl's