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3 years ago

HElP aND tHEy Are all DiffERent ???/questions

Mathematics

2 answers:

yKpoI14uk [10]3 years ago

7 0

Answer:

1. 840 red stripes and 720 white stripes

2. 12ft/second

3. 6 hours (24 min and 54 sec)

4. 30 girls

Step-by-step explanation:

guapka [62]3 years ago

6 0

Answer:

Step-by-step explanation:

840 red stripes

720 white stripes

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Find the area of the circle in terms of Pi. (TT) 10 cm A

Alinara [238K]

Answer:

A≈314.16

Step-by-step explanation:

7 0

3 years ago

From a random sample of size 18, a researcher states that (11.1, 15.7) inches is a 90% confidence interval for mu, the mean leng

alexandr402 [8]

Complete Question

From a random sample of size 18, a researcher states that (11.1, 15.7) inches is a 90% confidence interval for mu, the mean length of bass caught in a small lake. A normal distribution was assumed. Using the 90% confidence interval obtain:

a. A point estimate of $\mu$ and its 90% margin of error.

b. A 95% confidence interval for $\mu$ .

Answer:

$\= x = 13.4$ . $E = 2.3$

$10.7 < \mu < 16.1$

Step-by-step explanation:

From the question we are told that

The sample size is n = 18

The 90% confidence interval is (11.1, 15.7)

Generally the point estimate of $\mu$ is mathematically evaluated as

$\= x = \frac{11.1 + 15.7 }{2}$

=> $\= x = 13.4$

Generally the margin of error is mathematically evaluated as

$E = \frac{15.7 - 11.1}{2 }$

=> $E = 2.3$

From the question we are told the confidence level is 90% , hence the level of significance is

$\alpha = (100 - 90 ) \%$

=> $\alpha = 0.10$

Generally from the normal distribution table the critical value of $\frac{\alpha }{2}$ is

$Z_{\frac{\alpha }{2} } = 1.645$

Generally the equation for the lower limit of the confidence interval is

$\= x - Z_{\frac{\alpha }{2} } * \frac{s}{\sqrt{18} } = 11.1$

=> $13.4 - 0.3877 s = 11.1$

=> $s = 5.932$

From the question we are told the confidence level is 95% , hence the level of significance is

$\alpha = (100 - 95 ) \%$

=> $\alpha = 0.05$

Generally from the normal distribution table the critical value of $\frac{\alpha }{2}$ is

$Z_{\frac{\alpha }{2} } = 1.96$

Generally the margin of error is mathematically represented as

$E = Z_{\frac{\alpha }{2} } * \frac{\sigma }{\sqrt{n} }$

=> $E = 1.96 * \frac{5.932}{\sqrt{18} }$

=> $E = 2.7$

Generally 95% confidence interval is mathematically represented as

$\= x -E < \mu < \=x +E$

=> $13.4 - 2.7 < \mu < 13.4 + 2.7$

=> $10.7 < \mu < 16.1$

3 0

3 years ago

A number line is drawn left to right with integers spaced 1 centimeter apart. An ant crawls onto the number line at +3. It then

Anna11 [10]

Answer:

-1.2 cm

Step-by-step explanation:

Let's figure out where the ant is after each step.

Step 1

Start at +3.0

Move left - 1.5

Now at +1.5

Step 2

Start at +1.5

Move right + 4.9

Now at +6.4

Step 3

Start at +6.4

Move left - 7.6

Now at -1.2

The ant is now at -1.2 cm.

6 0

3 years ago

They’re 80 skittles in a bag 20% of them are read how many skittles a red

Nutka1998 [239]

Answer: 16

Step-by-step explanation: 80x20=1600

Put the decimal place where it belongs

80% of 20=16

Hope this helps!

7 0

3 years ago

50 1/2 divided by 1/4 = 202 How are the numbers related?

Stels [109]

Answer:

see the explanation

Step-by-step explanation:

Let

$x=50\frac{1}{2}=\frac{50*2+1}{2}=\frac{101}{2}$

$y=\frac{1}{4}$

Find the ratio x/y

$\frac{x}{y}=\frac{(101/2)}{(1/4)} =\frac{101*4}{2*1}=202$

therefore

$\frac{x}{y}=202$

$x=202y$

That means----> The first number (50 1/2) is 202 times greater than the second number (1/4)

3 0

3 years ago

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