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2 years ago

Jill bought 7 pounds of melon and 0.9 pounds of cherries. How much fruit did she buy in all

Mathematics

1 answer:

erik [133]2 years ago

6 0

Answer:

7.9 pounds of fruit

Step-by-step explanation:

In all means to add, so 7 + .9 = 7.9 pounds

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Mr. Robinson took a nap 12 out of the 15 days of his vacation what what percent of Mr. Robinsons vacation did he nap

jonny [76]

Answer:

80%

Step-by-step explanation:

convert to percent:

$\frac{12}{15}*100 = 80 percent$

8 0

2 years ago

Which number line represents the solution |2x|-12 =

Bond [772]

Answer:

Third option, last one

Step-by-step explanation:

Let's solve for x first.

|2x| - 12 = -2

|2x| = 10

2x = 10 or -2x = 10

x = 5 or x = -5

The number line that represents this is the last one.

3 0

3 years ago

The number of cars running a red light in a day, at a given intersection, possesses a distribution with a mean of 3.6 cars and a

Iteru [2.4K]

Answer:

$X \sim N(3.6,5)$

Where $\mu=3.6$ and $\sigma=5$

Then we have:

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

With the following parameters:

$\mu_{\bar X}= 3.6$

$\sigma_{\bar X} = \frac{5}{\sqrt{100}}= 0.5$

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 number of cars running a red light of a population, and for this case we know the distribution for X is given by:

$X \sim N(3.6,5)$

Where $\mu=3.6$ and $\sigma=5$

Since the distribution for X is normal then we know that the distribution for the sample mean $\bar X$ is given by:

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

With the following parameters:

$\mu_{\bar X}= 3.6$

$\sigma_{\bar X} = \frac{5}{\sqrt{100}}= 0.5$

5 0

3 years ago

Factor the expression completely. 2-12x

Nikitich [7]

Answer:

2(1 - 6x)

Step-by-step explanation:

2-12x

Common factor: 2

Factored equation:

2(1 - 6x)

7 0

3 years ago

Joan has an equal number of dimes and quarters with a total value of

Ghella [55]

First, let's define the variables d and q as follows:

d: total number of dimes
q: total number of quarters.

"Joan has an equal number of dimes and quarters" means that d=q.

"...with <span>with a total value of $1.40</span>" means that

0.1 d + 0.25 q =1.40. ***

This is because Joan has a total of d dimes each with a value of 0.1$, and a total of q quarters, each with a value of 0.25.

Since d=q, we can write the equation *** as:

0.1 q +0.25 q=1.40

0.35 q=1.40

q=1.40/0.35 = 4.

Thus, Joan has a total of 4 quarters, and 4 dimes.

Answer: 8 coins.

3 0

3 years ago