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3 years ago

Help please! im tired :c

Mathematics

1 answer:

11111nata11111 [884]3 years ago

7 0

A, C, D are the correct answer.

I hope this is helpful.

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An environmental science teacher at a high school with a large population of students wanted to estimate the proportion of stude

AnnZ [28]

Answer:

60 students

Step-by-step explanation:

The confidence interval of a proportion is given by:

$p\pm z*\sqrt{\frac{p*(1-p)}{n} }$

Where 'p' is the proportion of students who responded 'yes', 'z' is the z-score for a 95% confidence interval (which is known to be 1.960), and 'n' is the number of students in the sample.

If the confidence interval is from 0.584 to 0.816, then:

$p=\frac{0.584+0.816}{2}=0.7 \\0.816-0.584=2*(1.96*\sqrt{\frac{p*(1-p)}{n}}) \\0.116=1.96*\sqrt{\frac{0.7*(1-0.7)}{n}}\\n=16.8966^2*(0.7*0.3)\\n=60\ students$

60 students were in the sample.

8 0

3 years ago

Find an exponential function of the form y = ab* that passes through the points (0,4)

IrinaK [193]

Answer:

2nd option

Step-by-step explanation:

given an exponential function in the form y = a $b^{x}$

to find a and b use the coordinate points it passes through

using (0, 4 ) , then

4 = a $b^{0}$ [ $b^{0}$ = 1 ] , that is

a = 4 , so

y = 4 $b^{x}$

using (2, 100 )

100 = 4b² ( divide both sides by 4 )

25 = b² ( take the square root of both sides )

$\sqrt{25}$ = b , that is

b = 5

then exponential function is

y = 4 . $5^{x}$

6 0

2 years ago

A figure is shown with the given dimensions.

Illusion [34]

Answer:

$\blue{A = 24~ft^2}$

Step-by-step explanation:

This figure is a trapezoid with bases of 10 ft and 6 ft and height of 3 ft.

$A = \dfrac{b_1 + b_2}{2}h$

$A = \dfrac{10~ft + 6~ft}{2} \times 3~ft$

$\blue{A = 24~ft^2}$

4 0

2 years ago

A store sells comic books. Each comic book costs the same amount. During a sale, the store reduces the price of each comic book

Kruka [31]

Answer:

the original price is $7.89

the price on sale is $6.44

i hope this helps

Step-by-step explanation:

divide $12.88 by 2 to get the price of one of those comic books on sale which gives you $6.44

if you want the original price you just add $1.45 to $6.44 and then thats the price before the sale.

8 0

2 years ago

There are 3 red balls, 5 green balls, and 1 yellow ball in a hat. If you draw the yellow ball, you gain $10. If you draw any of

shepuryov [24]

Answer:

19.44

Step-by-step explanation:

We have the following information:

3 red balls, 5 green balls, and 1 yellow ball

In total there are 3 + 5 + 1 = 9 balls.

We calculate the probability of each:

Network: 3/9

Green: 5/9

Yellow: 1/9

Each one corresponds a price in profit or losses:

Network: 4

Green: -3

Yellow: 10

So in total it would be the sum of the multiplication of the probability and the price and then multiply everything by 25:

(4 * 3/9 + -3 * 5/9 + 10 * 1/9) * 25 = (0.777) * 25

= 19.44

6 0

3 years ago

Help please! im tired :c​

Help please! im tired :c