15% of the apples in a crate are rotten. There are 12 rotten apples in the crate.

I need help ASAP!!!!!!!!!!!!!!!

Andre45 [30]

Answer:

Take a better picture so I can see better

Step-by-step explanation:

4 0

4 years ago

8xy+4xy^2 what is the result ?

Molodets [167]

Answer:

4xy(2+y)

Step-by-step explanation:

Factor 4 x y out of 8 x y .

$4xy(2)+4xy^2$

Factor 4xy out of $4xy^2$

4xy(2) + 4xy(y)

Factor 4 x y out of 4 x y ( 2 ) + 4 x y ( y ) .

4xy(2+y)

hope this helps :)

7 0

3 years ago

What is the sum of 12 – 5i and –3 + 4i? –16 + 63i 9 – i 9 – 9i 15 – 9i

Svetach [21]

Answer:

$\boxed{ \bold{ \huge{ \boxed{ \sf{9 - i}}}}}$

Step-by-step explanation:

$\sf{12 - 5i + ( - 3 + 4i)}$

When there is a ( + ) in front of an expression in parentheses, there is no need to change the sign of each term. That means, the expression remains the same. Just remove the parentheses

$\longrightarrow{ \sf{12 - 5i - 3 + 4i}}$

Collect like terms

$\longrightarrow{ \sf{ 12 - 3 - 5i + 4i}}$

Subtract 3 from 12

$\longrightarrow{ \sf{9 - 5i + 4i}}$

Collect like terms

$\longrightarrow{ \sf{9 - i}}$

Hope I helped!

Best regards! :D

3 0

3 years ago

Read 2 more answers

It is known that IQ scores form a normal distribution with a mean of 100 and a standard deviation of 15. If a researcher obtains

sdas [7]

Answer:

$X \sim N(100,15)$

Where $\mu=100$ and $\sigma=15$

We select a sample of n=16 and we are interested on the distribution of $\bar X$ , since the distribution for X is normal then we can conclude that the distribution for $\bar X$ is also normal and given by:

$\bar X \sim N(\mu, \frac{\sigma}{\sqrt{n}})$

Because by definition:

$\bar X = \frac{\sum_{i=1}^n X_i}{n}$

$E(\bar X) = \mu$

$Var(\bar X) = \frac{\sigma^2}{n}$

And for this case we have this:

$\mu_{\bar X}= \mu = 100$

$\sigma_{\bar X} = \frac{15}{\sqrt{16}}= 3.75$

Step-by-step explanation:

Previous concepts

Normal distribution, is a "probability distribution that is symmetric about the mean, showing that data near the mean are more frequent in occurrence than data far from the mean".

The Z-score is "a numerical measurement used in statistics of a value's relationship to the mean (average) of a group of values, measured in terms of standard deviations from the mean".

Solution to the problem

Let X the random variable that represent the IQ scores of a population, and for this case we know the distribution for X is given by:

$X \sim N(100,15)$

Where $\mu=100$ and $\sigma=15$

We select a sample of n=16 and we are interested on the distribution of $\bar X$ , since the distribution for X is normal then we can conclude that the distribution for $\bar X$ is also normal and given by:

$\bar X \sim N(\mu, \frac{\sigma}{\sqrt{n}})$

Because by definition:

$\bar X = \frac{\sum_{i=1}^n X_i}{n}$

$E(\bar X) = \mu$

$Var(\bar X) = \frac{\sigma^2}{n}$

And for this case we have this:

$\mu_{\bar X}= \mu = 100$

$\sigma_{\bar X} = \frac{15}{\sqrt{16}}= 3.75$

6 0

3 years ago

Find x X= Can someone pls help

garik1379 [7]

Answer:

Step-by-step explanation:

6

4 0

3 years ago