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Shalnov [3]
3 years ago
7

(a) Jane pumped 54 gallons of water out of her pool. This was done over a period of 9 minutes at

Mathematics
2 answers:
STALIN [3.7K]3 years ago
6 0
Answer: -6
Step-by-step explanation:
From the question, Elsa pumped 18 gallons of water out of her pool and this was done over a period of 3 minutes at a constant rate. Since it is done at a content rate, to get the change in the amount of water in the pool each minute, we divide 18 gallons by 3. This can be written mathematically as:
= 18 gallons ÷ 3
= 6 gallons
Change = -6
The change in the amount of water in the pool each minute will be -6gallons hope this helps
klemol [59]3 years ago
5 0

Answer:

The change in the amount of water in the pool each minute was 6 gallons.

Step-by-step explanation:

You divide 54 gallons by 9 minutes to get the number of gallons per minute.

54/9 = 6

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A random sample of 20 purchases showed the amounts in the table (in $). The mean is $49.57 and the standard deviation is $20.28.
son4ous [18]

Answer:

The 98​% confidence interval for the mean purchases of all​ customers is ($37.40, $61.74).

Step-by-step explanation:

We have that to find our \alpha level, that is the subtraction of 1 by the confidence interval divided by 2. So:

\alpha = \frac{1-0.98}{2} = 0.01

Now, we have to find z in the Ztable as such z has a pvalue of 1-\alpha.

So it is z with a pvalue of 1-0.01 = 0.99, so z = 2.325

Now, find M as such

M = z*\frac{\sigma}{\sqrt{n}}

In which \sigma is the standard deviation of the population and n is the size of the sample.

M = 2.325*\frac{20.28}{\sqrt{20}} = 12.17

The lower end of the interval is the mean subtracted by M. So it is 49.57 - 12.17 = $37.40.

The upper end of the interval is the mean added to M. So it is 49.57 + 12.17 = $61.74.

The 98​% confidence interval for the mean purchases of all​ customers is ($37.40, $61.74).

3 0
3 years ago
15
Keith_Richards [23]
Do u have a picture?
5 0
3 years ago
Please help me with this question.​
Stels [109]

Step-by-step explanation:

Mean of the origibal set = 20

No. of terms = 10

Sum = Mean x No. of terms

= 20 x 10 = 200

The sum of additional numbers to make the new set of observstion is 4 + 8 + 12...... + 40 = 220

New Sum = 200 + 220 = 420

The no of terms stay the same

New Mean = New Sum/ N

= 420/10

= 42

7 0
2 years ago
Solve the equation for the given variable. *<br> 3(x + 4) – 2 = 10
algol13

Answer: 0

Step-by-step explanation:

3)(x)+(3)(4)+−2=10

(3x)+(12+−2)=10

3x+10=10

3x+10−10=10−10

3x=0

3x/3 = 0/3

x=0

6 0
3 years ago
how to work out the surface areas of cuboid? height=2cm length=10cm width=7cm Please do it step by step
Radda [10]

Answer:

 208 you find the area of each face then add them up

Step-by-step explanation:

6 0
3 years ago
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