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Alex
2 years ago
8

the times of all 15 year olds who run a certain race are approximately normally distributed with a given mean

Mathematics
1 answer:
Butoxors [25]2 years ago
8 0

The percentage of the runners who have times less than 14.4 sec is  0.15%

The times of all 15-year old who run a certain race are approximately normally distributed with a given mean of 18 sec and a standard deviation of 1.2 sec.

We know that,

where,

X = raw score = 14.4

μ = mean = 18

σ = standard deviation = 1.2

Putting the values,

Finding the probability from the z score table, we get

P(z < -3) = 0.00135 = 0.135%

Disclaimer: The question is incomplete. Please read below to find the missing content.

Question: The times of all 15-year-olds who run a certain race are approximately normally distributed with a given mean of 026-1 = 18 seconds and a standard deviation of 026-2. = 1.2 sec. What percentage of the runners have times less than 14.4 seconds?

0.15%

0.15%

0.30%

0.60%

2.50%

Learn more about percentages here brainly.com/question/809966

#SPJ4

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Is the relationship shown by the data linear? If so, model the data with an equation.
zhenek [66]

Answer:

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Step-by-step explanation:

Given:

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point B( x₂ , y₂) ≡ (-5, 9)  

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4 0
3 years ago
helpp Points (0, −3) and (7, 11) lie on the same line in the standard xy-coordinate plane. What is the slope of this line? A. -3
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6 0
3 years ago
Rationalize the denominator.
AlekseyPX

Hello and Good Morning/Afternoon!

<u>Let's take this problem step-by-step</u>:

<u>What the problem asks for:</u>

  ⇒ to rationalize the denominator

      ⇒ rationalize means that you multiply the numerator and

          demonimator by the denominator

<u>Let's put that into action</u>:

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<u></u>

Hopefully that helps!

4 0
1 year ago
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