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3 years ago

How many triangles are there in the picture ?

Mathematics

2 answers:

hammer [34]3 years ago

7 0

Answer:

there are 10 triangles

Step-by-step explanation:

Semmy [17]3 years ago

6 0

10 I think all of it is triangles except the middle of the star

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2 years ago

An airplane flies 315 km in 1 hour 45 minutes. Calculate the average speed.

valentina_108 [34]

Answer:

3 km per minute

Step-by-step explanation:

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2 years ago

25 points BRAINLIEST The sum of two numbers is 18. The sum of the greater number and twice the smaller number is 25. Find the nu

Mamont248 [21]

Answer:

11 and 7.

Step-by-step explanation:

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2 years ago

The owner of an electronics store received a shipment of MP3 players at a cost of $64.25 each. If he sells the MP3 players for $

Marizza181 [45]

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2 years ago

Read 2 more answers

If we wanted to create a new 90% confidence interval from a different sample for the proportion of those with a two on one date

slava [35]

Answer: 271

Step-by-step explanation:

The formula we use to find the sample size is given by :-

$n=p(1-p)(\dfrac{z_{\alpha/2}}{E})^2$

, where $z_{\alpha/2}$ is the two-tailed z-value for significance level of $(\alpha)$

p = prior estimation of the proportion

E = Margin of error.

If prior estimation of the proportion is unknown, then we take p= 0.5 , the formula becomes

$n=0.5(1-0.5)(\dfrac{z_{\alpha/2}}{E})^2$

$n=0.25(\dfrac{z_{\alpha/2}}{E})^2$

Given : Margin of error : E= 0.05

Confidence level = 90%

Significance level $\alpha=1-0.90=0.10$

Using z-value table , Two-tailed z-value for significance level of $0.10$

$z_{\alpha/2}=1.645$

Then, the required sample size would be :

$n=0.25(\dfrac{1.645}{0.05})^2$

Simplify,

$n=270.6025\approx271$

Hence, the required minimum sample size =271

3 0

3 years ago