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2 years ago

13

if a class of 20 students 40% are boys. twenty-five percent often boys and 50% of the girls wear glasses. how many students wear

glasses.

1 answer:

shtirl [24]2 years ago

7 0

2 boys and 6 girls wear glasses, so 8 students wear glasses

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One researcher wishes to estimate the mean number of hours that high school students spend watching tv on a weekday. a margin of

PtichkaEL [24]

Margin of error, e = Z*SD/Sqrt (N), where N = Sample population

Assuming a 95% confidence interval and substituting all the values;
At 95% confidence, Z = 1.96

Therefore,
0.23 = 1.96*1.9/Sqrt (N)

Sqrt (N) = 1.96*1.9/0.23

N = (1.96*1.9/0.23)^2 = 262.16 ≈ 263

Minimum sample size required is 263 students.

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2 years ago

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Leila's fish tank has 17 liters of water in it.she plans to add 4 liters per minute until the tank has atleast 45 liters .What a

jeyben [28]

Answer:

11.25 minutes possibly

Step-by-step explanation:

1.forget the 17 liters for now

2. divide 45 & 4

3. you should get 11.25

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2 years ago

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What's the greatest common factor of: 2*2*2*2*3*3*3*5*2*2*3*3*3*7

erastova [34]

the greater common factor is : a.2

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3 years ago

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Selina claims single having one exemption. Her state tax deduction is 21% of her federal tax contribution. Calculate the amount

alekssr [168]

Need the tax table to answer the questuon

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A plastic ball is filled with gel to make a stress ball. If the ball has a radius of 4 cm, how much

Dafna1 [17]

Answer:

267.947 cm^{3} of gel is required to fill the plastic ball.

Step-by-step explanation:

<em>The radius of the ball is given as 4 cm.</em>

<em>The gel is filled in the plastic ball, that means the gel occupies the volume of the radius.</em>

The volume of the sphere is given by the formula,

$V = \frac{4}{3}(\pi)R^{3}$ , the R is the radius of sphere.

$V = \frac{4}{3}(\pi)(4)^{3} = 267.947 cm^{3}$

Thus, the volume of gel required to fill the plastic ball to make it stress ball is

267.947 cm^{3} of gel.

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3 years ago