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sp2606 [1]
3 years ago
15

Rainwater was collected in water collectors at thirty different sites near an industrial basin and the amount of acidity (pH lev

el) was measured. The mean and standard deviation of the values are 5.2 and 1.8 respectively. When the pH meter was recalibrated back at the laboratory, it was found to be in error. The error can be corrected by adding 0.2 pH units to all of the values and then multiply the result by 1.2. Find the mean and standard deviation of the corrected pH measurements.

Mathematics
1 answer:
Aleonysh [2.5K]3 years ago
3 0

Answer:

mean = 7.98; standard deviation = 2.52

Step-by-step explanation:

Kindly check the attached images below to see the step by step explanation to the question above.

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Anna Keichline purchased six bushes for $19.27 each, a porch swing for $88.22, and a gas grill for $321.77. She must pay the sta
katrin2010 [14]

Answer:

$559.77


Step-by-step explanation:

Total cost  = 6(19.27)+1(88.22)+1(321.77)=525.61

We need to find 4.5% of 525.61. This will be state tax.

We need to find 2% of 525.61. This will be city tax.


Converting 4.5% to decimal (4.5 divided by 100) and then multiplying with 525.61 will give us the answer.

State tax = \frac{4.5}{100}*525.61=0.045*525.61=23.65

City tax = \frac{2}{100}*525.61=0.02*525.61=10.51


Grand total purchase price is 525.61 + 23.65 + 10.51 = $559.77

5 0
3 years ago
Read 2 more answers
At​ noon, a tank contained 5 cm of water. After several​ hours, it contained 3 cm of water. What is the percent decrease of wate
Oksanka [162]

Answer:

40%

Step-by-step explanation:

2cm loss from 5cm.

2 fifths of the water has gone.

2/5 given as 100ths is is calculated by multiplying both top and bottom by 20

2x20 =40

5x20= 100

40/100

or 40%

7 0
3 years ago
Am stuck on this question and show your working please.
Tamiku [17]

Answer:

1. 6pi or 18.84cm

2. 20pi or 62.8cm

3. 13pi or 40.82cm

4. 9.5pi or 29.83cm

5. You calculate the circumference of a circle with the expression 2pi(r). r stands for the radius. You can also use pi(d), or pi x diameter.

7. You would use 2pi(r) to find the circumference of a circle when given the value of the circle's radius.

8. You would use pi(d) to find the circumference of a circle when given the value of the circle's diameter.

5 0
3 years ago
If five squares, each with sides equal to 4n, are divided into 4 equal squares as shown, what will be of the sum of the perimete
vivado [14]
Side of a square = 4n

Side of the smaller square = 4n÷2 = 2n

Perimeter of one smaller square = 2n x 4 = 8n

Perimeter of 20 smaller squares = 8n x 20 = 160n

------------------------------------------------------------------------------
Answer: Perimeter of all the 20 smaller squares = 160n
------------------------------------------------------------------------------

4 0
4 years ago
Order these numbers from greatest to least -3.25, -3, 3.3, -3.3, 3.5
marysya [2.9K]
3.5 , 3.3, -3, -3.25, -3.3
7 0
3 years ago
Read 2 more answers
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