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Nostrana [21]
3 years ago
10

Plz help. Dora calculated the mean absolute deviation for the data set 35, 16, 23, 42, and 19. Her work is shown below. Step 1:

Find the mean. mean = StartFraction 35 + 16 + 23 + 42 + 19 Over 5 EndFraction = 27 Step 2: Find each absolute deviation. 8, 11, 4, 15, 8 Step 3: Find the mean absolute deviation. M A D = StartFraction 8 + 11 + 4 + 15 Over 5 EndFraction = 9.5 What is Dora’s error?
A. Dora should have divided by 4 when finding the mean

B. Dora found the absolute deviation of 35 incorrectly

C. Dora used only four numbers in finding the mean

D. Dora used only four numbers in finding the mean absolute deviation
Mathematics
1 answer:
blondinia [14]3 years ago
7 0

Answer:

step 3 is wrong

Step-by-step explanation:

i know it because i did the unit test review

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Meredith solved a quadratic equation. Her work is shown below.
Damm [24]

Answer:

Step 2

Step-by-step explanation:

Meredith made a fatal mistake or error in step 2;

Any quadratic problem will always have two solutions. Therefore since, we only have one solution here, it is wrong. The mistake was incurred in step 2;

  From the given problem ;

    <u> Wrong                                                  right</u>

    2(x + 4)² = 242

    (x + 4)² = 121     Step 1  

     x+4=11              Step 2                  x + 4  = ± 11

     x  = 7                Step 3                  x + 4  = 11 or x + 4  = -11

                                                           x  = 11- 4     or    x  = -11 - 4

                                                           x  = 7 or -15

3 0
3 years ago
The graph below shows the depth of water in a river over a period of 10 days during what time span did the depth of the water re
vova2212 [387]
Correct answer:
days 3 through 4; 8.5 feet
8 0
3 years ago
14. Determine the arc length of AB. Give your answer to two decimal places.
mafiozo [28]

<u>Given </u><u>:</u><u>-</u>

  • A circle with radius 9m .

<u>To </u><u>Find</u><u> </u><u>:</u><u>-</u>

  • The length of arc AB .

<u>Solution</u><u> </u><u>:</u><u>-</u><u> </u>

In the given figure arc AB subtends an angle of 124° at the centre . Firstly convert this into radians as ,

\longrightarrow \pi rad. = 180^o

So,

\longrightarrow 124^o = \dfrac{\pi}{180^o}\times 124^o

\\\longrightarrow 124^o = 2.16 \ rad

Now we may use the formula ,

\longrightarrow length = radius \times \theta

Substitute the respective values,

\longrightarrow \widehat{AB}= 9m\times2 .16

Multiply ,

\longrightarrow \underline{\underline{\widehat{AB}= 19.48 \ m}}

<u>Hence</u><u> the</u><u> required</u><u> answer</u><u> is</u><u> </u><u>1</u><u>9</u><u>.</u><u>4</u><u>8</u><u>m</u><u> </u><u>.</u>

6 0
3 years ago
Simplify: 2(4x + 8)<br> (X)<br> /h<br> X<br> X
jasenka [17]

Answer:

x = -2

Step-by-step explanation:

2(4x+8)

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8 0
4 years ago
Anyone know this I'm struggling
-BARSIC- [3]

Answer

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Step-by-step explanation:

Write al the sides together: 2x + 5 + x^2 - 6 + 4x^2 + 2x + x^2 - 3x

Then organize the terms: 2x + 2x - 3x + 5 - 6 + x^2 + x^2 + 4x^2

Simplify: 2x + 2x - 3x + 5 - 6 + x^2 + x^2 + 4x^2

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              x + 5 - 6 + x^2 + x^2 + 4x^2

              5 - 6 = -1

              x - 1 + x^2 + x^2 + 4x^2

              x^2 + x^2 + 4x^2 = 2x^2 + 4x^2 = 6x^2

             x - 1 + 6x^2

6 0
3 years ago
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