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Serggg [28]
3 years ago
11

Write your answer as a fraction or as a whole mixed number. 2 5/11 - 10 7/11

Mathematics
2 answers:
telo118 [61]3 years ago
8 0

The answer is -90/11

kaheart [24]3 years ago
3 0

Answer:

-90/11

Step-by-step explanation:

convert each mixed number into a improper fraction

27/11  - 117/11

= -90/11

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Answer:

a. z-score = -1.2

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Step-by-step explanation:

a. Transformation to z-score

Mathematically;

z-score = (x - μ)/σ

where σ and μ are the standard deviation and the mean respectively.

From the question, x = 23, μ = 27.2 and σ = 3.5

Let’s put these into the equation;

z-score = (23-27.2)/3.5 = -1.2

b. Interpretation of result

The interpretation is that 23 years old is -1.2 standard deviations below the mean

c. Determination

The age is not unusual. This is because any z-value below -2 or above 2 is considered unusual

-1.2 is above -2 and thus it is not unusual

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