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3 years ago

Can y'all pleas help me with this

Mathematics

2 answers:

Katena32 [7]3 years ago

8 0

Answer:

Step-by-step explanation:

Siri said thats right

Lesechka [4]3 years ago

6 0

Answer:

-18

Step-by-step explanation:

the square root of 324 is 18, so you add the negative sign, and get your answer

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PLZ HELP!!! Will give brainiest if correct! Thxs!!!!!!!!

Mazyrski [523]

$\frac{1.7 \times {10}^{ - 3} }{3 \times {10}^{2} } \\ = \frac{1.7}{3} \times {10}^{ - 3 - 2} \\ = 0.56 \times {10}^{ - 5} \\ = 5.6 \times {10}^{ - 6}$

4 0

3 years ago

The Customer Service Center in a large New York department store has determined that the amount of time spent with a customer ab

GarryVolchara [31]

Using the normal distribution, the probabilities are given as follows:

a) 0.6517 = 65.17%

b) 0.0823 = 8.23%.

c) 0.6109 = 61.09%.

<h3>Normal Probability Distribution</h3>

The z-score of a measure X of a normally distributed variable with mean $\mu$ and standard deviation $\sigma$ is given by:

$Z = \frac{X - \mu}{\sigma}$

The z-score measures how many standard deviations the measure is above or below the mean.

Looking at the z-score table, the p-value associated with this z-score is found, which is the percentile of X.

The mean and the standard deviation are given, respectively, by:

$\mu = 8.9, \sigma = 2.8$

Item a:

The probability is the p-value of Z when X = 10, hence:

$Z = \frac{X - \mu}{\sigma}$

$Z = \frac{10 - 8.9}{2.8}$

Z = 0.39

Z = 0.39 has a p-value of 0.6517.

0.6517 = 65.17% probability that the time is less than 10 minutes.

Item b:

The probability is the one subtracted by the p-value of Z when X = 5, hence:

$Z = \frac{X - \mu}{\sigma}$

$Z = \frac{5 - 8.9}{2.8}$

Z = -1.39

Z = -1.39 has a p-value of 0.0823.

0.0823 = 8.23% probability that the time is more than 5 minutes.

Item c:

The probability is the p-value of Z when X = 15 subtracted by the p-value of Z when X = 8, hence:

X = 15:

$Z = \frac{X - \mu}{\sigma}$

$Z = \frac{15 - 8.9}{2.8}$

Z = 2.18

Z = 2.18 has a p-value of 0.9854.

X = 8:

$Z = \frac{X - \mu}{\sigma}$

$Z = \frac{8 - 8.9}{2.8}$

Z = -0.32

Z = -0.32 has a p-value of 0.3745.

0.9854 - 0.3745 = 0.6109 = 61.09%.

More can be learned about the normal distribution at brainly.com/question/4079902

#SPJ1

5 0

2 years ago

Elimination 2x - 5y = 8 x - 3y = -1

ruslelena [56]

X=29 and y=10

You would isolate one of the variables and then plug the expression into the other equation to find the value of one variable. Then you would plug this value into the other equation to determine the value of the remaining variable.

8 0

3 years ago

ANother free Braniliet to the first 2 people to answer this question! 3(2 + x)

alexira [117]

Answer:

6+3x

Step-by-step explanation:

3(2 + x)

Distribute

3*2 + 3*x

6+3x

5 0

3 years ago

Convert 0.865 from Base 10 to Base 2.8 and 16.

svetlana [45]

Answer:

Don't know

Step-by-step explanation:

can't help u in this

sorry

I am from India what about you I think Canada because I choose in states Canada

3 0

3 years ago