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3 years ago

Look at pic!! #9 pls. Thank youuuuu. 20 points

Mathematics

1 answer:

Karolina [17]3 years ago

4 0

35n=280
n=8 8 dimes and 8 quarters

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A random variable x is normally distributed with a mean of 100 and a variance of 25. Given that x = 110, its corresponding z- sc

Rashid [163]

A random variable x is normally distributed with a mean of 100 and a variance of 25. Given that x = 110, its corresponding z- score is 0.40.

Answer: The given z-score is false.

Explanation: We are given:

Mean, $\mu=100$ ,

Variance, $\sigma^{2}=25$

$\therefore\sigma=\sqrt{\sigma^{2}}$

$=\sqrt{25}$

$=5$

The z-score formula is given below:

$z=\frac{x-\mu}{\sigma}$

$=\frac{110-100}{5}$

$=\frac{10}{5}$

$=2$

Therefore, the z-score corresponding x=100 is 2

Therefore, the given z-score = 0.4 is false.

4 0

4 years ago

In 2005, 8.1x10^10text messages were sent in the United States. In 2010, the number of annual text messages had risen to 1,863,0

densk [106]

You must divide the number of text messages in 2010 by the number of text messages in 2005.

Convert the number of text messages in 2010 to scientific notation:

$1\underbrace{,863,000,000,000}_{\leftarrow12}=1.863\cdot10^{12}$

Divide:

$(1.863\cdot10^{12})\div(8.1\cdot10^{10})=\dfrac{1.863\cdot10^{12}}{8.1\cdot10^{10}}=\dfrac{1.863}{8.1}\cdot10^{12-10}\\\\=0.23\cdot10^2=0.23\cdot100=23$

Answer: 23 many times.

Used:

$a^n:a^m=a^{n-m}$

8 0

4 years ago

you estimate the distance for your house to the park to be 3.2 miles. the actually distance was 2.8 miles. find the percent erro

timofeeve [1]

14.3%

difference/actual = (3.2 - 2.8)/2.8 x 100% = 14.3% (3sf)

do check out my insta for more tips (learntionary)

7 0

3 years ago

Charles rolled a ball across the floor and noticed that it stopped before reaching the other side of the room. A force applied t

katrin [286]

Answer:

Friction

Step-by-step explanation:

Because friction between the floor and the ball made the ball stopped from rolling.

5 0

3 years ago

Read 2 more answers

Which of the following best describes the relationship between these lines? 2x + 3y = - 24 and y=2/3x-24

Oksi-84 [34.3K]

2x + 3y = -24
3y = -2x - 24
y = -2/3x - 6....slope is -2/3, y int is -6

y = 2/3x - 24....slope = 2/3, y int = -24

** different slopes, different y intercepts means there will be 1 solution.....they are not parallel or perpendicular.

answer is : none of these

5 0

3 years ago