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3 years ago

There are 78 students in the fourth grade 39 of them are girls

Mathematics

2 answers:

Zepler [3.9K]3 years ago

6 0

What is the rest of the problem or equation ?

ira [324]3 years ago

5 0

Answer:

This means that the answer is 39

Step-by-step explanation:

if u subtract 78 from 39 u get 39 just as if u add 39 + 39= 78.

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One of the more famous anecdotes in the field of statistics is known as the "Lady Tasting Tea" and involves the renowned statist

mote1985 [20]

Answer:

$n=\frac{0.3(1-0.3)}{(\frac{0.01}{1.96})^2}=8067.36$

And rounded up we have that n=8068

Step-by-step explanation:

The margin of error for the proportion interval is given by this:

$ME=z_{\alpha/2}\sqrt{\frac{\hat p (1-\hat p)}{n}}$ (a)

We want for this case a 95% of confidence desired, our significance level would be given by $\alpha=1-0.95=0.05$ and $\alpha/2 =0.025$ . And the critical value would be given by:

$z_{\alpha/2}=-1.96, z_{1-\alpha/2}=1.96$

The margin of error for this case is $ME =\pm 0.01$ and we are interested in order to find the value of n, if we solve n from equation (a) we got:

$n=\frac{\hat p (1-\hat p)}{(\frac{ME}{z})^2}$ (b)

The estimated proportion for this case is $\hat p=0.3$ . And replacing into equation (b) the values from part a we got:

$n=\frac{0.3(1-0.3)}{(\frac{0.01}{1.96})^2}=8067.36$

And rounded up we have that n=8068

7 0

3 years ago

What is the area of a half circle with a radius of 40 cm?

Andre45 [30]

Answer:

5027 square centimeters (cm2)

Step-by-step explanation:

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2 years ago

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1/2 +2/3=? What's the answer?

11111nata11111 [884]

1 $\frac{1}{6}$

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3 years ago

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Estimate the product of 204 times 0.46

nikdorinn [45]

204 times .46 equals 93.84, to round of it would be 93.8

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3 years ago

14 x 3 = 7 x ___ x 3 14 x 3 = ___ Need answer ASAP

Elena L [17]

Answer:

14 x 3 = 7 x 2 x 3 = 42

Step-by-step explanation:

14 x 3 = 42

so, 7 x 2 = 14

then, 14 x 3 = 42

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3 years ago

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