I need help on the graphs

Mathematics

1 answer:

Anton [14]3 years ago

5 0

Answer:

y < 4

y > 2x - 4

y > -2x - 4

Step-by-step explanation:

For each line, figure out the equation, and then turn the = into a < or > depending on which side of the line you want to include.

Example, line B has equation y = 2x - 4, and you want to be above it, so y has to be larger than 2x - 4.

The second graph works the same way, try it.

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The times of all 15 year olds who run a certain race are approximately normally distributed with a given mean Mu = 18 sec and st

Brrunno [24]

The percentage of runners having times less than 14.4 sec is 0.15%. Then the correct option is A.

<h3>What is normal a distribution?</h3>

It is also called the Gaussian Distribution. It is the most important continuous probability distribution. The curve looks like a bell, so it is also called a bell curve.

The times of all 15-year-olds who run a certain race are approximately normally distributed with a given mean (μ) = 18 sec and standard deviation (σ) = 1.2 sec.

The runners have times less than 14.4 sec.

The z-score is a numerical measurement used in statistics of the value's relationship to the mean of a group of values, measured in terms of standards from the mean.

$\rm z-score = \dfrac{X - \mu}{\sigma }\\\\z-score = \dfrac{14.4- 18}{1.2}\\\\z-score = -3$