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2 years ago

I’m not entirely sure with this question! Giving brainliest answer. :)

Mathematics

2 answers:

Nina [5.8K]2 years ago

8 0

Answer:

i dont know if this is right but i tried

4*2y+p= 8y+p

aniked [119]2 years ago

4 0

You just need to simply distribute the 4:

4(2y + p)

8y + 4p

Hope this helps! :)

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2 years ago

Without using Desmos what is the complete factorization of 2x^2+x-15? Please show work , please help

andrezito [222]

The last one x+5 2x-3

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3 years ago

In a recent poll, 35% of survey respondents said that, if they only had one child, they would prefer the child to be a boy. Supp

Schach [20]

Answer:

we have that z = 1.8326 which is not close to z factor of 0. The result is not within limits.

Step-by-step explanation:

Following normal approximation to binomial we have

mean = n×p

standard deviation = √(n×p×(1-p))

n is equal to 160

p is equal to 35%

n×p is equal to 150×0.35 = 52.5

this is the probability that you would expect based on the knowledge that 35% of survey respondents said they would prefer a boy than a girl.

in your survey you got 74 out of 150 and you want to know if this is statistically significant or if you can expect this deviation by chance.

standard deviation is calculated as √(n×p× (1-p))which becomes

√ (150×0.35×0.75 = 6.2749 which is more than enough accuracy for what is required.

without a continuity correction, your formula would be:

z (74 > 52.5) = (population mean - sample mean) / population standard deviation which becomes (74-52.5)/6.2749 = 1.8326

this is not close to a z factor of 0 which means that the results are not within limits.

with a continuity correction, your formula would be:

z (52.5 > 52.5) = 0

A z factor of zero means that your sample mean is exactly the population mean.

3 0

3 years ago

Jeanette obtained 32% for her statistics test, which was out of a total of 300 marks. How much should she score in the computer

Andre45 [30]

Using weighted average, it is found that she should score 67% on the computer science test.

The weighted average is given by <u>each proportion multiplied by it's score</u>.

In this problem, the proportions and scores are given by:

Proportion of 32% = 0.32 for a score of 300.
Proportion of x for a score of 200.
Proportion of 46% = 0.46 for a score of 300 + 200 = 500.

Then

$0.32(300) + 200x = 0.46(500)$

$200x = 0.46(500) - 0.32(300)$

$200x = 134$

$x = \frac{134}{200}$

$x = 0.67$

She should score 67% on the computer science test.

A similar problem is given at brainly.com/question/24855677

7 0

3 years ago