HERE I AM AGAIN, HELPPPPP ILL GIVE BRAINLIEST <3

Mathematics

2 answers:

nikklg [1K]3 years ago

6 0

Answer:

For number three I think the blank represents 1.25

Step-by-step explanation:

For the third one:

I named the answer / total as x

-x - 2.25 = x

-x + 2.5 + 2.5 = x + 2.5

Simplifying it would give 1.25

(I'm unsure for the answer but I tried!)

HOPE THIS HELPS!!

fredd [130]3 years ago

5 0

it equals 2.75 because 2 negatives means you add

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Step-by-step explanation:

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A certain article reported the following observations, listed in increasing order, on drill lifetime (number of holes that a dri

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Answer:

Sample mean =119.42

Median = 92

25% trimmed mean = 102.42

10% trimmed mean = 95.69

Step-by-step explanation:

Data in increasing order :

12 13 20 23 31 35 40 43 48 49 58 62 66 67 69 71 73 77 78 79 82 85 86 89 91 93 97 99 101 105 106 106 112 117 124 135 139 141 147 159 161 168 183 207 249 262 289 323 388 513

Total no. of observations = 50

Sample mean = $\frac{\text{Sum of all observations}}{\text{Total number of observations}}$

= $\frac{5971}{50}$ = 119.42

Median: Since we have even number of observation

Median = $\frac{1}{2}({25\text{th term} + 26\text{th term})$ = $\frac{91+93}{2}$ = 92

10% Trimmed Mean: We remove 5 values from each side

Trimmed set = 35 40 43 48 49 58 62 66 67 69 71 73 77 78 79 82 85 86 89 91 93 97 99 101 105 106 106 112 117 124 135 139 141 147 159 161 168 183 207 249

Trimmed mean = $\frac{\text{Sum of Trimmed Set}}{\text{Total number of observations}}$ = $\frac{4097}{40}$ = 102.42