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masha68 [24]
2 years ago
9

65 customers in 5 aisles​

Mathematics
1 answer:
Alik [6]2 years ago
6 0

Answer:

If you mean how many people are in each isle it would be, 13.

If your finding out about how many people are in each isle using division then you would do 65 ÷ 5 = 13

I'm not quite sure what your question is but i hope this helps :)

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7/16 should be the answer
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3 years ago
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According to the WHO MONICA Project the mean blood pressure for people in China is 128 mmHg with a standard deviation of 23 mmHg
Sati [7]

Answer:

a) Mean blood pressure for people in China.

b) 38.21% probability that a person in China has blood pressure of 135 mmHg or more.

c) 71.30% probability that a person in China has blood pressure of 141 mmHg or less.

d) 8.51% probability that a person in China has blood pressure between 120 and 125 mmHg.

e) Since Z when X = 135 is less than two standard deviations from the mean, it is not unusual for a person in China to have a blood pressure of 135 mmHg

f) 157.44mmHg

Step-by-step explanation:

When the distribution is normal, we use the z-score formula.

In a set with mean \mu and standard deviation \sigma, the zscore of a measure X is given by:

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

The Z-score measures how many standard deviations the measure is from the mean. After finding the Z-score, we look at the z-score table and find the p-value associated with this z-score. This p-value is the probability that the value of the measure is smaller than X, that is, the percentile of X. Subtracting 1 by the pvalue, we get the probability that the value of the measure is greater than X.

If X is two standard deviations from the mean or more, it is considered unusual.

In this question:

\mu = 128, \sigma = 23

a.) State the random variable.

Mean blood pressure for people in China.

b.) Find the probability that a person in China has blood pressure of 135 mmHg or more.

This is 1 subtracted by the pvalue of Z when X = 135.

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

Z = \frac{135 - 128}{23}

Z = 0.3

Z = 0.3 has a pvalue of 0.6179

1 - 0.6179 = 0.3821

38.21% probability that a person in China has blood pressure of 135 mmHg or more.

c.) Find the probability that a person in China has blood pressure of 141 mmHg or less.

This is the pvalue of Z when X = 141.

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

Z = \frac{141 - 128}{23}

Z = 0.565

Z = 0.565 has a pvalue of 0.7140

71.30% probability that a person in China has blood pressure of 141 mmHg or less.

d.)Find the probability that a person in China has blood pressure between 120 and 125 mmHg.

This is the pvalue of Z when X = 125 subtracted by the pvalue of Z when X = 120. So

X = 125

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

Z = \frac{125 - 128}{23}

Z = -0.13

Z = -0.13 has a pvalue of 0.4483

X = 120

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

Z = \frac{120 - 128}{23}

Z = -0.35

Z = -0.35 has a pvalue of 0.3632

0.4483 - 0.3632 = 0.0851

8.51% probability that a person in China has blood pressure between 120 and 125 mmHg.

e.) Is it unusual for a person in China to have a blood pressure of 135 mmHg? Why or why not?

From b), when X = 135, Z = 0.3

Since Z when X = 135 is less than two standard deviations from the mean, it is not unusual for a person in China to have a blood pressure of 135 mmHg.

f.) What blood pressure do 90% of all people in China have less than?

This is the 90th percentile, which is X when Z has a pvalue of 0.28. So X when Z = 1.28. Then

X = 120

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

1.28 = \frac{X - 128}{23}

X - 128 = 1.28*23

X = 157.44

So

157.44mmHg

6 0
3 years ago
Area of trapezoids <br>find the area​
Zinaida [17]

Answer:

Area of the trapezoid = 6cm^2

Step-by-step explanation:

Area of a trapezoid:

(1/2)*Sum of parallel opposite sides +Distance between the parallel sides

Parallel sides are: 2 cm  and 4 cm

Distance between the parallel sides is 2 cm

Area of the trapezoid:

                            =\frac{1}{2}*(2+4)*2\\\\=\frac{1}{2}* 6*2\\\\=\frac{12}{2}\\\\ =6cm^2

Area of the trapezoid is 6cm^2

7 0
3 years ago
There are 13 animals in a barn. Some are Chickens and some are Pigs. Altogether
konstantin123 [22]

Answer:

Ahh! What a classic: Systems of Equations!

So, if you don't know what a system of equations is, its basically two equations with two variables combined into a system.

So, let x=# of pigs

And also, Let y=# of chickens

Let's make our first equation!

13=x+y

This is because there are 13 animals in a barn.

So then, knowing that a pig has 4 legs and a chicken 2:

40=4x+2y

This is because there are 40 legs in total, and we multiply the variable because that's how many legs each creature has.

So, here is our system!

\left \{ {{x+y=13} \atop {4x+2y=40}} \right.

Through Substitution (the inputting of something instead of a variable):

x+y=13\\x=13-y

Then, we input it into the next equation:

4(13-y)+2y=40\\52-4y+2y=40\\-2y=-12\\y=6

This means that there are 6 chickens, and by inputting it into the first equation:

x+6=13\\x=7

So there you have it!

FYI there are 6 chickens and 7 pigs.

Hope this helps!

P.S. Stay Safe!

8 0
3 years ago
Read 2 more answers
Answer please answer
lutik1710 [3]

Answer:

3= 1680

Step-by-step explanation:

6 0
3 years ago
Read 2 more answers
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