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sergejj [24]
4 years ago
9

Rin incorrectly calculated the mean absolute deviation for the data set 25,25,31,36,38.Her work is shown here. 1. Find the mean.

Mean = 25 + 25 + 31 + 36 + 38 5 = 155 5 = 31 2. Find each absolute deviation. Absolute deviations:6,6,0,5,7 3. Find the mean absolute deviation. MAD = 6 + 0 + 5 + 7 4 = 18 4 = 4.5 In which step did Rin make an error?
Mathematics
2 answers:
dexar [7]4 years ago
3 0
In Step 3 was Her Mistake
lara31 [8.8K]4 years ago
3 0

Answer:

Rin did mistake in 3rd step

Step-by-step explanation:

Mean is correct  according to rin's calculation

Absolute mean deviation is  |data value-mean|

Hence, values of absolute deviations are also correct

To find the Mean absolute deviation we sum the differences of absolute deviations and then divide by the number of observations

it should be 6+6+0+7+5=24/5=4.8

Not 18/4

Hence, Rin did mistake in 3rd step

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I'm really bad at age chart problems.<br> Can someone help me with this and provide an explanation?
Fed [463]

Answer: 10

Step-by-step explanation:

tony is 5 years younger than Marvin's age 1 year from now.

t = (m+1) - 5

t = m - 4

6 years ago tony was half as old as marvin was then.

t - 6 = 1/2(m - 6)

Get rid of the fraction, multiply both sides by 2

2(t-6) = m - 6

2t - 12 = m - 6

2t = m - 6 + 12

2t = m + 6

from the first statement, replace t with (m-4)

2(m-4) = m + 6

2m - 8 = m + 6

2m - m = 6 + 8

m = 14 is Marvin's present age

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how old is tony now?

t = 14 - 4

t = 10 yrs is tony's age

4 0
3 years ago
How many gallons of paint will you need in order to paint a wall that is 42 feet wide and 27 feet high if one gallon will cover
GREYUIT [131]

Answer:

42 x27  //// 1134 is the area

Step-by-step explanation:

1134/ 200= 5.67

You have to round up because you can’t get .67 of a paint bucket So you would have to round it out. <em>About 6 buckets.</em>

6 0
2 years ago
Which expressions are equivalent to 16x^2- 36
Eddi Din [679]
4(2x+3)(2x-3) is the answer
4 0
4 years ago
Tan^2x+sec^2x=1 for all values of x. <br> true or false?
amid [387]

This is not true.

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2\sec^2x-1=1\implies\sec^2x=1\implies\sec x=\pm1\implies x=n\pi

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5 0
3 years ago
Read 2 more answers
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ASHA 777 [7]

Answer:

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This tell us that the main measures of any rotated shape will not change.

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And because the perimeter is equal to the sum of all the side lengths, the perimeter also remains the same.

The only thing that changes will be the coordinates of our polygon.

4 0
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